CT Red seal prep #2 Flashcards
(100 cards)
1
Q
Which of the following is the minimum size for a basement vent?
a) At least three
b) Only one
c) Between 20 to 30
d) Between 40 to 50
A
a) At least three
Explanation: The minimum size for a basement vent should be able to handle at
least three fixtures to ensure adequate ventilation.
2
Q
Installed underground plumbing in an excavated trench should be covered with backfill to a depth of?
a) 250mm
b) 200mm
c) 300mm
d) 350mm
A
c) 300mm
3
Q
Which of these non-ferrous alloys is the heaviest?
a) Magnesium
b) Copper
c) Aluminum
d) Titanium
A
b) Copper
4
Q
What kind of pipe is used to transport water through a hot water heater?
a) diverter
b) supply
c) manometer
d) none of the above
A
b) supply
5
Q
A laser “light beam” strikes the target installed in a sewage pipe from
underneath. How is the drainage pipe grade corrected?
a) Adjust the target.
b) Raise the pipe.
c) Move the laser.
d) Lower the pipe.
A
b) Raise the pipe.
If a laser light beam strikes the target installed in a sewage pipe from underneath, the drainage pipe grade is corrected by raising the pipe to align
with the laser beam.
6
Q
How is it determined if extra PPE is necessary for a certain activity on the work site?
a) Observe what other workers are wearing.
b) Complete a hazard assessment.
c) Request information at next tool box meeting.
d) Ask the site foreman.
A
b) Complete a hazard assessment.
7
Q
Why are copper alloys used for industrial applications?
a) Copper alloys are magnetic so they can be used in motors
b) Copper alloys act as good insulators
c) Copper alloys do not work harden when cold worked
d) Copper alloys are resistant to corrosion
A
d) Copper alloys are resistant to corrosion
8
Q
Which pipe connection prevents sewage contamination of the water
treatment equipment’s water supply?
a) Air gap termination.
b) Stand pipe off floor drain.
c) Check valve on back wash line.
d) Air break termination.
A
a) Air gap termination.
9
Q
One tank of a twin tank water softener will hold the brine, while the other
will hold the?
a) activated carbon
b) green sand
c) zeolite
d) soda ash
A
c) zeolite
in a twin tank water softener, one tank holds the brine, while the other typically
contains zeolite, which is used to remove hardness minerals from the water through ion exchange.
10
Q
With a chemical pot feeder supplying a closed hydronic heating system, what is installed?
a) circulating pump
b) isolating valves
c) pressure relief valve
d) injectors
A
c) pressure relief valve
11
Q
Which of the following is the proper minimum size for a building trap’s fresh air inlet?
a) 3in
b) 2in
c) 1 ½ in
d) 4in
A
a) 3in
12
Q
What is utilised to prevent copper pipework from folding or bending while dealing with soft copper?
a) bending spring
b) bulkhead fitting
c) mounting partition
d) none of the above
A
a) bending spring
13
Q
Water with a dissolved mineral level more than 181 mg/L would be considered?
a) very hard
b) hard
c) soft
d) moderately hard
A
b) hard
14
Q
A drinking fountain’s drainage pipe must be which of the following?
a) indirectly connected to a sanitary drainage system
b) should be trapped
c) should have a diameter not less than 1-3/4 inches
d) directly connected to a sanitary drainage system
A
a) indirectly connected to a sanitary drainage system
15
Q
What role does the set serve on a hacksaw blade?
a) To increase the width of the kerf providing clearance for the blade body
b) To strengthen the blade along its entire length
c) To allow the blade to be easily mounted in the hacksaw frame
d) To allow the hacksaw teeth to be reground easily
A
a) To increase the width of the kerf providing clearance for the blade body
16
Q
Except for connecting, __________ a cross fitting may not be utilised in a DWV system.
a) four vents
b) branches that receive clear water waste
c) fixture drains of three compartment sinks
d) back to back fixtures
A
b) branches that receive clear water waste
17
Q
HWT is an acronym for what?
a) Water heater
b) Hot water faucet
c) Water holding tank
A
a) Water heater
18
Q
Is the “A Valve” a manual?
a) air valve
b) gas valve
c) hot water valve
d) cold water vale
A
b) gas valve
19
Q
Which element is used with copper to create brass?
a) Vanadium
b) Iron
c) Zinc
d) Tin
A
c) Zinc
20
Q
What is utilised to drain excess water from a basement that has
accumulated?
a) sump pump
b) effluent pump
c) sewage pump
d) air pump
A
a) sump pump
21
Q
What is the maximum vertical drop of a trap arm on a water closet?
a) 4m
b) 1m
c) 0. 6m
d) 100m
A
b) 1m
22
Q
Which of the following is the maximum horizontal or vertical dimension for an aperture in a fire separation that must be covered by a closure if only one side of the separation is sprinklered?
a) 3.7 m
b) 8 m
c) 4.6 m2
d) 14.2 m2
A
a) 3.7 m
23
Q
What is the grade % when there is a 216-inch drop and a 500-foot run?
a) 0.036
b) 0.065
c) 0.042
d) 0.028
A
a) 0.036
convert the drop into feet. then, To calculate the grade percentage, divide the drop by the run and multiply by
100.
24
Q
Which process is used to link plastic pipe in a natural gas service?
a) Thermal fusion.
b) Threading.
c) Solvent welding.
d) Brazing.
A
a) Thermal fusion.
25
What is the smallest size of a commercial dishwasher's trap?
a) 1 ½
b) 1
c) 2
d) 2 ½
c) 2
26
A positive displacement pump, a gear pump must be equipped with?
a) pressure relief valve
b) pressure switch
c) pressure reducing valve
d) pressure tank
a) pressure relief valve
This is because these pumps can generate high pressure, and the relief valve prevents excess pressure buildup that could damage the system
27
What is the correct process for repairing a damaged CPVC pipe fitting on a hydronic heating system?
a) Drain, isolate remove joint apply primer solvent weld to new spool and fitting
and install
b) Isolate, drain remove joint solvent weld to new spool and fitting and install
c) Isolate, drain remove joint apply primer to new spool and fitting and install
d) Isolate, drain remove joint apply primer solvent weld to new spool and fitting
and install
d) Isolate, drain remove joint apply primer solvent weld to new spool and fitting
and install
28
This device is used to prevent the entry of gases into a structure.
a) Gasket
b) P trap
c) Ball valve
d) Quick tee adaptor
b) P trap
29
How is the flush duration of a conventional diaphragm-style flushometer valve lengthened?
a) Install a new vacuum breaker.
b) Open the control stop fully.
c) Turn the flushometer bonnet screw counter clockwise.
d) Turn the bypass screw counter clockwise.
d) Turn the bypass screw counter clockwise.
30
Even in the fully open state, all valves experience some degree of frictional flow loss. Which kind of valve reduces flow the most even while it is open?
a) globe
b) gate
c) plug valve
d) swing check valve
a) globe
31
If 600 feet of pipe weighs 900 pounds, how much would 140 feet of the same pipe weigh?
a) 210
b) 202
c) 217
d) 190
a) 210
32
Which of the following voltages provides the most energy efficiency?
a) 240 static voltage.
b) 220 line voltage.
c) 110 line voltage.
d) 120 static voltage.
a) 240 static voltage.
33
Maximum number of water closet vents that may be attached to a 1-1/2 in branch vent.
a) 4
b) 8
c) 3
d) 2
d) 2
34
Empty, a 60 gallon water heater weights 52.5 pounds. How much does it weigh when it is completely filled?
a) 581
b) 553
c) 564
d) 500
b) 553
60 x 8.33lbs/g = 499.8 + 52.5 = 552.3 lbs
35
Before choosing a hydronic circulator, what must be determined?
a) System resistance and flow rate.
b) System resistance and pipe size.
c) Height of building and flow rate.
d) Height of building and pipe size.
a) System resistance and flow rate.
36
The coil of a hydronic heating and cooling convector are identical. How many pipes will enter the convector?
a) Two for heating and one for cooling.
b) One for heating and two for cooling.
c) One for heating and one for cooling.
d) Two for both the heating and cooling.
c) One for heating and one for cooling.
A hydronic heating and cooling convector with identical coils will
have two pipes entering the convector, one for heating and one for cooling
37
When the water pressure changes, which approach will rectify the occasional discharge from a reduced pressure principle backflow preventer?
a) Install a swing check valve upstream of the RP.
b) Install a swing check valve downstream of the RP.
c) Put in a stronger check valve spring upstream of the RP.
d) Restrict the water flow to the RP by using a globe valve.
c) Put in a stronger check valve spring upstream of the RP.
38
Which connecting technique is only permitted for underground and outside
water service piping?
a) Soldering the joint.
b) Brazing the joint.
c) Flaring the pipe.
d) Compression fittings.
d) Compression fittings.
39
typically, confined places are harmful because they contain?
a) flood hazards
b) restricted access and egress
c) c.limited room for maneuverability
d) explosive atmospheres
b) restricted access and egress
40
Which of the following causes friction loss?
a) seal
b) pressure
c) ventilation
d) suction
d) suction
41
Using a builder's level, the backsight reading at the reference position is 1.450m, while the foresight reading at the target point is 1.750 metres. What is the elevation of the destination if the reference point is 100 m?
a) 99.750 m
b) 101.750 m
c) 99.700 m
d) 101.450 m
a) 99.750 m
The elevation of the destination can be calculated as:
Reference elevation - (backsight - foresight) = 100 m - (1.450 m - 1.750 m) = 100 m - (-0.300
m) = 100 m + 0.300 m = 100.300 m.
42
What kind of fitting is used to connect copper and galvanised pipe?
a) solder joint
b) coupling
c) dielectric union
d) lead solder
c) dielectric union
43
At minimum grade, a 4-inch building sewer must extend 75 metres from the building to a manhole. What is the total fall on the line?
a) 0.5 m
b) 1.0 m
c) 0.25 m
d) 0.75 m
a) 0.5 m
44
Which of the following is the smallest branch size in respect to three bathroom groups that drain to a branch?
a) 3in
b) 2in
c) 1 ½ in
d) 4in
b) 2in
45
0.8 is the specific gravity of a particular kind of oil. How much does 1 litre of oil weigh?
a) 0.8kg
b) 0.16kg
c) 0.75kg
d) 0.6kg
a) 0.8kg
Explanation: Since the specific gravity is a ratio of the density of the oil to the density of water, 1 liter of oil with a specific gravity of 0.8 would weigh 0.8 kg (as 1 liter of water weighs 1 kg).
46
What is the minimum distance between the two outermost shower heads if
four shower heads are positioned along a wall?
a) 1100mm
b) 2.25m
c) 850mm
d) 1.9m
b) 2.25m
47
What considerations must be made while installing the drainage plumbing for a wall-mounted urinal?
a) The installation of a vacuum breaker backflow preventer.
b) The location of the cleanout above the fixture flood level rim.
c) The maximum temperature of waste entering the drainage system.
d) The type of piping material used for the fixture drain and vent piping above
the flood level rim.
b) The location of the cleanout above the fixture flood level rim.
48
Which of the following cannot be linked indirectly to a drainage system?
a) water softener backwash
b) drinking fountain
c) commercial dishwasher
d) sterilize
c) commercial dishwasher
Explanation: A commercial dishwasher cannot be linked indirectly to a drainage
system due to the nature of its waste, which may contain food particles and
grease that require direct disposal into the sanitary drainage system.
49
Which of the following must be performed to fix a leaking OS and Y gate valve correctly?
a) Reduce water supply pressure.
b) Remove and tighten valve stem.
c) Tighten flange bolts evenly.
d) Tighten packing nuts evenly
c) Tighten flange bolts evenly.
50
A sink with three compartments is an example of a?
a) ternary
b) combination
c) multiple
c) multiple
51
What must be understood to properly size a lawn irrigation system's sprinkler coverage?
a) Size of water service piping, size of water meter and static water pressure.
b) Size of water service piping, size of water meter and dynamic water pressure.
c) Size of water distribution piping, size of water meter and dynamic water
pressure.
d) Size of water distribution piping, size of water meter and static water pressure.
c) Size of water distribution piping, size of water meter and dynamic water
pressure.
52
Which of the following is not a hot water heating pipe system?
a) two pipe direct return
b) series loop
c) one pipe gravity return
d) two pipe reverse return
c) one pipe gravity return
53
Which P-trap size is required for a kitchen sink?
a) 1.5in
b) 1.0in
c) 2.0in
d) 1 3/4in
a) 1.5in
54
Which of the following is the smallest radius for a 2 in. bend? schedule #40 pipe?
a) 4 pipe diameters.
b) 3 pipe diameters.
c) 6 pipe diameters.
d) 8 pipe diameters.
a) 4 pipe diameters.
55
What is the name for soft metal that has been stuck between the teeth of a
file?
a) The file is pinned
b) The file is clogged
c) The file is wedged
d) The file is blocked
a) The file is pinned
56
The washbasins in public restrooms for women should?
a) equal to the number of required water closets in the washroom
b) provided with shut-off valves installed on the water supply to the fixture
c) barrier-free accessible in all cases
d) not visible from the entrance to the room in all cases
c) barrier-free accessible in all cases
57
157) What DWV piping approach is permissible when a manufacturer's expansion joint for a 75 mm dirt stack is unavailable?
a) Install an MJ or similar rubber coupling before passing through the floor.
b) Install a 1.5 m offset before passing through the floor.
c) Install a 1 m offset before passing through the floor.
d) Install a 1.2 m offset before passing through the floor.
b) Install a 1.5 m offset before passing through the floor.
58
Which production process yields the most durable pipe?
a) butt weld
b) extruded
c) lap weld
d) spiral weld
a) butt weld
59
What should be done if a float and thermostatic trap are causing condensate to back up? The initial load is not very heavy. There is no leakage in
the coils of the linked steam-to-water heat exchanger?
a) Check the thermostatic element.
b) Check the float orifice for blockage.
c) Check for dirt or wear on the seat and disc.
d) Check the float’s air vent hole for blockage.
b) Check the float orifice for blockage.
60
In conjunction with a sand filter, water softener, and activated carbon filter,
where would the chlorinator be installed?
a) Between the sand filter and the activated carbon filter.
b) Between the activated carbon filter and the water softener.
c) After the water softener and the activated carbon filter
d) Before the sand filter, activated carbon filter and softener.
d) Before the sand filter, activated carbon filter and softener.
61
What must a commercial dishwasher consider before discharging into an interceptor?
a) Copper drainage piping installed within 1.2 meters of the interceptor.
b) Copper drainage piping is installed before the interceptor.
c) The flow rating of the interceptor.
d) The discharge rate from the dishwasher.
d) The discharge rate from the dishwasher.
62
A 60cm diameter by 150cm long horizontal cylindrical tank is partly filled with water to a height of 48cm. Find the water's volume?
a) 362L
b) 364L
c) 366L
d) 370L
a) 362L
To find the volume of water in a cylindrical tank partly filled, you would use the formula for the volume of a cylinder and adjust for the partial fill. In this case, the volume would be approximately 362 liters.
63
A heating system needs a flow switch in-line. Where would a switch of this
kind be located?
a) Make-up water line.
b) Supply main.
c) Return main.
d) Expansion tank line.
b) Supply main.
64
Which is the right way for attaching cast fittings to threaded steel pipe?
a) Apply thread compound to male thread and tighten with pipe wrench.
b) Apply teflon tape to male thread and tighten with spanner wrench.
c) Apply teflon tape to female thread and tighten with pipe wrench.
d) Apply thread compound to female thread and tighten with spanner wrench.
a) Apply thread compound to male thread and tighten with pipe wrench.
65
What is the maximum positive or negative pressure differential permitted in
a DWV system?
a) 2in water column
b) 3m water column
c) 1in water column
d) 1.5in water column
a) 2in water column
66
How many fixture units would an air conditioner that discharges 0.05 L/s of
condensate into a floor drain be equivalent to?
a) 1
b) 2
c) 11
d) 5
b) 2
67
What is the water pressure entering a home?
a) 60-70 psi
b) 50-60 psi
c) 100-120 psi
d) 20-30 psi
b) 50-60 psi
68
After an evaluation of a hot water heating system reveals that the system pressure exceeds the designed operating pressure, the system pressure must be
reduced. Which component will create this issue?
a) Outdoor compensator.
b) Water-feed valve.
c) Pressure relief valve.
d) Circulator.
b) Water-feed valve.
69
What is the estimated rough-in size of the centre line of a floor flange supplying a typical water closet?
a) 300 mm (12 in.) measured from the finished wall.
b) 300 mm (12 in.) measured from the finished floor.
c) 300 mm (12 in.) measured from the rough wall.
d) 300 mm (12 in.) measured from the rough floor.
a) 300 mm (12 in.) measured from the finished wall.
70
The discharge from a sump pump must have the following fittings fitted, in
order of flow:
a) union, check valve, shut-off valve
b) check valve, shut-off valve, union
c) check valve, union, shut-off valve
d) shut-off, coupling, check valve
a) union, check valve, shut-off valve
71
What kind of fittings should be used on an island vent, and how should a return bend be made beneath the drain board?
a) Four 45 degree bends
b) Two 90 degree bends
c) A 45 degree, 90 degree and 45 degree bend
d) A 45 degree, 90 degree, 45 degree and 90 degree bend
c) A 45 degree, 90 degree and 45 degree bend
72
Six lavatories will be erected along a 530 cm-long wall and will be ventilated with twin vents. Determine the distance from centre to centre between vents assuming each fixture is 51 cm broad.
a) 55cm
b) 76cm
c) 107cm
d) 93cm
b) 76cm
he distance from center to center between vents for six lavatories along a 530 cm-long wall would be approximately 76 cm, assuming each fixture is 51cm wide and the vents are evenly distributed.
73
What angle is used to estimate the bolt hole spacing when putting out a gasket for an 8-hole flange?
a) 45°
b) 30°
c) 90°
d) 22 1/2°
b) 30°
74
Which device must be installed on the water supply line that connects to the bottom of a commercial water heater?
a) Vacuum relief valve located at least 6” above the tank.
b) Temperature and pressure relief within the top 150 mm (6 in.) of the tank.
c) Atmospheric vacuum breaker within the top 150 mm (6 in.) of the tank.
d) Check valve located 6” before tank if plastic pipe is used.
a) Vacuum relief valve located at least 6” above the tank.
75
Using 45° elbows, a cold water pipe is offset by 1,2 metres. What is the estimated length of the pipe that runs diagonally?
a) 1.8 m
b) 1.7 m
c) 2.0 m
d) 1.5 m
b) 1.7 m
76
When the water pressure changes, which approach will rectify the occasional discharge from a reduced pressure principle backflow preventer?
a) Install a swing check valve upstream of the RP.
b) Install a swing check valve downstream of the RP.
c) Put in a stronger check valve spring upstream of the RP.
d) Restrict the water flow to the RP by using a globe valve.
c) Put in a stronger check valve spring upstream of the RP.
Installing a stronger check valve spring upstream of a Reduced Pressure
Principle (RP) backflow preventer can help rectify occasional discharges due to
water pressure changes by ensuring the check valve closes more securely.
77
Which of the following is the minimum size required for a clean out on a 6" sanitary building drainage main?
a) 6in
b) 5in
c) 2in
d) 4in
a) 6in
78
Which of the following is the maximum support spacing for a horizontal PVC
plastic DWV pipe?
a) 1500 mm
b) 1600 mm
c) 2200 mm
d) 1200 mm
a) 1500 mm
79
Who uses sweat or solder copper alloy fittings?
a) soft copper tubing
b) steel tubing
c) hard copper tubing
d) rubber hoses
c) hard copper tubing
80
At the upstream end of a drainage pipe hung from a ceiling within a building, there is a distance of 7.5" between the ceiling and the pipe's centre. What is the distance from the ceiling to the pipe's centre if it goes 26 feet
horizontally, has an 8-foot horizontal offset, and then continues 37 feet?
a) 20.5”
b) 17.75”
c) 23.25”
d) 25.25”
c) 23.25”
The distance from the ceiling to the pipe’s center after the described configuration would depend on the slope of the pipe. Assuming a standard
slope for drainage, the distance would be calculated based on the total length
and change in elevation.
81
What does this emblem on a pair of safety boots indicate?
a) The boots are made of natural leather.
b) The boots have rubber soles.
c) The boots are electrically insulating.
d) The boots have protective plates.
d) The boots have protective plates.
82
A kitchen sink with two compartments is being replaced with a sink with
three compartments. What modifications to drainage are required to finish the
installation?
a) The fixture trap and fixture drain is to be one pipe size larger than largest sink
outlet.
b) Another plumbing trap and vent is required for the extra sink.
c) The garbage grinder must be installed in the middle compartment.
d) Fixture outlet length cannot be less than 1.2 m
a) The fixture trap and fixture drain is to be one pipe size larger than largest sink
outlet.
83
Which of the following are valves used on home hot water supply tanks and
heaters?
a) globe, plug pressure, relief
b) gate, check and safety
c) pressure, temperature, vacuum relief
d) swing check, butterfly, temperature relief
c) pressure, temperature, vacuum relief
84
Where is 8 in. Class 1500 asbestos cement non-pressure sewage pipe
installation permitted?
a) Underground in a potable water system.
b) Above ground in a venting system.
c) Underground under a building.
d) Above ground inside a building.
d) Above ground inside a building.
85
Where must the continuous vent be attached when horizontally wet-vented fixtures are utilised?
a) In front of the first fixture.
b) Between the two most upstream fixtures.
c) Midway between the first and last fixture.
d) Between the two most downstream fixtures.
b) Between the two most upstream fixtures.
86
What are the minimal dimensions for vents supplying an oil interceptor?
a) 1 ¼
b) 1
c) 3
d) 4
a) 1 ¼
87
An interceptor may serve as a trap for a fixture if?
a) vent is increased one size
b) it is located within 8’ of the fixture
c) it has a 38mm water seal
d) all of the above
d) all of the above
88
What is the minimum needed distance between the top of storage and conventional sprinkler deflectors?
a) 18 in.
b) 14 in.
c) 22 in.
d) 24 in.
a) 18 in.
89
What corrective action is required to fix a diaphragm-type flush valve supplying a constantly operating business toilet?
a) Reseat the dislodged diaphragm.
b) Clean out the diaphragm orifice.
c) Turn down the control stop.
d) Replace the vacuum breaker.
c) Turn down the control stop.
90
How do you cut ABS pipe?
a) At an angle to maintain proper grade.
b) Flush so that pipe will fit into the socket.
c) Flush to ensure proper pipe alignment.
d) Square to provide full joining surface.
d) Square to provide full joining surface.
91
Which systems may residential water pipes empty into?
a) the closest river
b) public sewer system
c) septic system of public sewer system
d) septic system of sump pump
c) septic system of public sewer system
92
Should wrenches be pushed rather than pulled?
a) False
b) True
b) True
93
A horizontally offset, circuit-vented branch with two 45-degree fittings will
require?
a) not permitted
b) additional circuit vent
c) two relief vents
d) increase one pipe size
a) not permitted
94
The temperature and pressure relief valve of a service water heater must
discharge within this distance of a floor drain or appropriate place.
a) 300mm
b) 200mm
c) 400mm
d) 500mm
a) 300mm
95
What force would be exerted on the gate of a 6" gate valve if the water pressure
operating on it was 46 psi?
a) 1301
b) 867
c) 2604
d) 5202
a) 1301
he force exerted on the gate of a 6" gate valve with water pressure operating on it at 46 psi can be calculated using the formula for the area of a circle (πr²) and multiplying by the pressure. The force would be approximately 1301 pounds.
96
Which of the following is the minimum run time shown on the engine if a diesel fire pump has been operating for at least 12 weeks?
a) 6 hours.
b) 4 hours.
c) 8 hours.
d) 10 hours.
c) 8 hours.
97
What precautions must be taken while working with PVC solvent cements
and primers within an enclosed structure?
a) Wear approved gloves, keep containers tightly closed when not in use, open only when brush is to be used to dispense primer or solvent cement and ventilate area.
b) Keep containers tightly closed when not in use, open only when brush is to be
used to dispense primer or solvent cement and ventilate area.
c) Wear leather palmed gloves and only cut a small hole in the lid of the
containers large enough for the brush required to dispense materials.
d) Wear cotton gloves, cut a small hole in the lid of the containers large enough
for the brush required to dispense materials and ventilate area as needed.
a) Wear approved gloves, keep containers tightly closed when not in use, open only when brush is to be used to dispense primer or solvent
98
What is placed to repair the water hammer that occurs when a faucet is
abruptly closed?
a) Regulating quick opening valves.
b) Manufactured arrestors.
c) 1/2” by 18” air chambers.
b) Manufactured arrestors.
99
Which of the following is the minimum grade necessary when establishing a dry pipe system's main?
a) 1/2 in. per 8 ft.
b) 1/4 in. per 10 ft.
c) 1/4 in. per 12 ft.
d) 1/2 in. per 8 ft.
b) 1/4 in. per 10 ft
100
which backflow preventer is placed on a chemically treated boiler?
a) Pressure vacuum breaker.
b) Double check valve assembly.
c) Reduced pressure principle backflow preventer.
d) Dual check with atmospheric port.
c) Reduced pressure principle backflow preventer.
