TEXAS MASTER PLUMBING EXAM WITH QUESTIONS &
100% CORRECT ANSWERS | COMPREHENSIVE GUIDE
WITH 200 QUESTIONS & CORRECT ANSWERS | LATEST
2026/2027 (GUARANTEED PASS)
What degree is used for isometric drawings? - CORRECT ANSWER-60 degrees
What is the recommended minimum of minutes for chlorine water management? - CORRECT
ANSWER-20-30 minutes
When you need to repair a single handle lavatory faucet, what needs to be replaced? - CORRECT
ANSWER-O ring
Who can approve a backflow prevention device? - CORRECT ANSWER-The authority having
jurisdiction
Testing on a backflow prevention device shall be done by - CORRECT ANSWER-a certified
backflow assembly tester
A bathtub spout with an effective opening of 1 inch in diameter is not affected by the nearest
sidewall. What minimum distance is required for the tub filler spouts air gap. - CORRECT
ANSWER-2 inches
For water pipe safety prevention, what is the minimum backflow prevention? - CORRECT
ANSWERPressure vacuum breaker
Direct connections between the potable water supply and sewer-connected wastes - CORRECT
ANSWER-shall not exist under any condition
The minimum vertical length for a gravity type water heater vent is - CORRECT ANSWER-5 feet
All of the following types of fire vents serving a gas fired water heater may pass through a wall or
ceiling except - CORRECT ANSWER-a single wall vent
,The minimum elevation at which a vacuum breaker may be installed above the flood level rim of
the device it services is called the - CORRECT ANSWER-critical level
What is the minimum backflow preventer for a flushometer valve? - CORRECT ANSWER-
Atmospheric Vacuum Breaker (AVB)
PVB - CORRECT ANSWER-Pressure Vacuum Breaker
RPPB - CORRECT ANSWER-Reduced Pressure Principle Backflow
Water closet tank ballcocks shall be installed with vacuum breaker critical level at least - CORRECT
ANSWER-1 inch above the full opening of the overflow tube
Ballcocks in water closet tanks shall be installed so that the critical level of the vacuum breaker
or the bottom of the water inlet is above the full opening of the overflow pipe, at least -
CORRECT ANSWER-1 inch
What type of vacuum breaker is used for swimming pools? - CORRECT ANSWER-Atmospheric
vacuum breaker
Water pipes that supply swimming pools require what minimum backflow protection? - CORRECT
ANSWER-Atmospheric vacuum breaker
Type __________ copper water pipe shall not be installed below grade under a building. -
CORRECT ANSWER-M
Type M copper pipe may be installed in all locations except - CORRECT ANSWER-beneath the
building and underground
Copper tubing identified by a yellow stripe is Type __________ - CORRECT ANSWER-DWV
Yellow
Copper tubing with yellow stripe - CORRECT ANSWER-DWV
, Copper tubing with green stripe - CORRECT ANSWER-K
Copper tubing with Blue stripe - CORRECT ANSWER-L
Copper tubing with Red stripe - CORRECT ANSWER-M
Hard drawn copper tubing shall bear a 1/4 inch strip of indelible ink marking it as type, color coded
- CORRECT ANSWER-green
If a contractor takes great care in removing an old 2 inch copper pipe from a heating system and
caps the ends so no debris can enter, what must he do to use the material in another potable water
system? - CORRECT ANSWER-This is NOT ALLOWED by the code
What type of connector is used with PEX piping? - CORRECT ANSWER-Slide in and easy style
connector
Which of the following water piping is not allowed in residential service for hot and cold? -
CORRECT ANSWER-PVC
Valves up to and including ___________ inches shall be of brass or other approved materials. -
CORRECT ANSWER-2
A flushometer valve shall have an approved vacuum breaker installed to work in conjunction with
the valve. The vacuum breaker is required to be located - CORRECT ANSWER-on the discharge
side of the flushometer
The critical level of the vacuum breaker on a flushometer valve shall be what minimum height
above a urinal? - CORRECT ANSWER-6 inches
Water supply to more than one building shall be equipped with _________ valve to shut off separate
buildings. - CORRECT ANSWER-separate fully to each single family dwelling
A full flow non-restricting valve must be installed in the water distribution system on the
_____________________ - CORRECT ANSWER-discharge side of the meter
100% CORRECT ANSWERS | COMPREHENSIVE GUIDE
WITH 200 QUESTIONS & CORRECT ANSWERS | LATEST
2026/2027 (GUARANTEED PASS)
What degree is used for isometric drawings? - CORRECT ANSWER-60 degrees
What is the recommended minimum of minutes for chlorine water management? - CORRECT
ANSWER-20-30 minutes
When you need to repair a single handle lavatory faucet, what needs to be replaced? - CORRECT
ANSWER-O ring
Who can approve a backflow prevention device? - CORRECT ANSWER-The authority having
jurisdiction
Testing on a backflow prevention device shall be done by - CORRECT ANSWER-a certified
backflow assembly tester
A bathtub spout with an effective opening of 1 inch in diameter is not affected by the nearest
sidewall. What minimum distance is required for the tub filler spouts air gap. - CORRECT
ANSWER-2 inches
For water pipe safety prevention, what is the minimum backflow prevention? - CORRECT
ANSWERPressure vacuum breaker
Direct connections between the potable water supply and sewer-connected wastes - CORRECT
ANSWER-shall not exist under any condition
The minimum vertical length for a gravity type water heater vent is - CORRECT ANSWER-5 feet
All of the following types of fire vents serving a gas fired water heater may pass through a wall or
ceiling except - CORRECT ANSWER-a single wall vent
,The minimum elevation at which a vacuum breaker may be installed above the flood level rim of
the device it services is called the - CORRECT ANSWER-critical level
What is the minimum backflow preventer for a flushometer valve? - CORRECT ANSWER-
Atmospheric Vacuum Breaker (AVB)
PVB - CORRECT ANSWER-Pressure Vacuum Breaker
RPPB - CORRECT ANSWER-Reduced Pressure Principle Backflow
Water closet tank ballcocks shall be installed with vacuum breaker critical level at least - CORRECT
ANSWER-1 inch above the full opening of the overflow tube
Ballcocks in water closet tanks shall be installed so that the critical level of the vacuum breaker
or the bottom of the water inlet is above the full opening of the overflow pipe, at least -
CORRECT ANSWER-1 inch
What type of vacuum breaker is used for swimming pools? - CORRECT ANSWER-Atmospheric
vacuum breaker
Water pipes that supply swimming pools require what minimum backflow protection? - CORRECT
ANSWER-Atmospheric vacuum breaker
Type __________ copper water pipe shall not be installed below grade under a building. -
CORRECT ANSWER-M
Type M copper pipe may be installed in all locations except - CORRECT ANSWER-beneath the
building and underground
Copper tubing identified by a yellow stripe is Type __________ - CORRECT ANSWER-DWV
Yellow
Copper tubing with yellow stripe - CORRECT ANSWER-DWV
, Copper tubing with green stripe - CORRECT ANSWER-K
Copper tubing with Blue stripe - CORRECT ANSWER-L
Copper tubing with Red stripe - CORRECT ANSWER-M
Hard drawn copper tubing shall bear a 1/4 inch strip of indelible ink marking it as type, color coded
- CORRECT ANSWER-green
If a contractor takes great care in removing an old 2 inch copper pipe from a heating system and
caps the ends so no debris can enter, what must he do to use the material in another potable water
system? - CORRECT ANSWER-This is NOT ALLOWED by the code
What type of connector is used with PEX piping? - CORRECT ANSWER-Slide in and easy style
connector
Which of the following water piping is not allowed in residential service for hot and cold? -
CORRECT ANSWER-PVC
Valves up to and including ___________ inches shall be of brass or other approved materials. -
CORRECT ANSWER-2
A flushometer valve shall have an approved vacuum breaker installed to work in conjunction with
the valve. The vacuum breaker is required to be located - CORRECT ANSWER-on the discharge
side of the flushometer
The critical level of the vacuum breaker on a flushometer valve shall be what minimum height
above a urinal? - CORRECT ANSWER-6 inches
Water supply to more than one building shall be equipped with _________ valve to shut off separate
buildings. - CORRECT ANSWER-separate fully to each single family dwelling
A full flow non-restricting valve must be installed in the water distribution system on the
_____________________ - CORRECT ANSWER-discharge side of the meter
