Texas Plumbing Exam 2026–2027 | Complete Study
Guide, Practice Questions, Verified Answers &
Licensing Exam Prep
Air break ( drainage system) - correct answers -A piping arrangement in which a drain from a fixture,
appliance, or device discharge indirectly into a fixture, receptacle or interceptor at a point below the
flood level rim of the receptacle so installed as to prevent backflow or siphonage
Air gap (drainage system) - correct answers -The unobstructed vertical distance through the free
atmosphere between the outlet of the waste pipe and the flood level rim of the receptacle into which
the waste pipe is discharging.
Backflow - correct answers -Pressure created by any means in the water distribution system, which by
being in excess of the pressure in the water supply mains causes a potential backflow condition.
Backflow connection - correct answers -Any arrangement whereby backflow can occur.
Backflow Preventer - correct answers -Air gap
Bathroom group - correct answers -A group of fixtures consisting of a water closet, lavatory, bathtub or
shower, including or excluding a bidet, an emergency floor drain or both. Such fixtures are located
together on the same floor level.
Branch interval - correct answers -A vertical measurement of distance 8 feet or more between
connections of horizontal branches to a drainage stack. Measurements are taken down the stack from
highest horizontal branch connection
Stack system - correct answers -Are used in high rises for venting
1
, Wet venting - correct answers -Causes siphoning of water out of p traps
1 pound of water - correct answers -1 btu will heat
Access - correct answers -Ready access or removal of panel, door, etc
Faucet - correct answers -What fixture uses an air break
Building sewer - correct answers -Yard line
Building Drain - correct answers -Under the building
Combination waste and vent system - correct answers -A specially designed system of waste piping
embodying the horizontal wet venting of one or more sinks or floor drains by means of a common waste
and vent pipe adequately sized to provide free movement of air above the flow line of the drain.
Combination Waste and Vent system - correct answers -Drain is acting as vent
Common vent - correct answers -A vent connecting at the junction of two fixture drains and serving as a
vent for both fixtures
Contamination - correct answers -An impairment of the quality of the potable water that creates an
actual hazard to the public health through poisoning or the spread of disease by sewage, industrial fluids
or waste
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Guide, Practice Questions, Verified Answers &
Licensing Exam Prep
Air break ( drainage system) - correct answers -A piping arrangement in which a drain from a fixture,
appliance, or device discharge indirectly into a fixture, receptacle or interceptor at a point below the
flood level rim of the receptacle so installed as to prevent backflow or siphonage
Air gap (drainage system) - correct answers -The unobstructed vertical distance through the free
atmosphere between the outlet of the waste pipe and the flood level rim of the receptacle into which
the waste pipe is discharging.
Backflow - correct answers -Pressure created by any means in the water distribution system, which by
being in excess of the pressure in the water supply mains causes a potential backflow condition.
Backflow connection - correct answers -Any arrangement whereby backflow can occur.
Backflow Preventer - correct answers -Air gap
Bathroom group - correct answers -A group of fixtures consisting of a water closet, lavatory, bathtub or
shower, including or excluding a bidet, an emergency floor drain or both. Such fixtures are located
together on the same floor level.
Branch interval - correct answers -A vertical measurement of distance 8 feet or more between
connections of horizontal branches to a drainage stack. Measurements are taken down the stack from
highest horizontal branch connection
Stack system - correct answers -Are used in high rises for venting
1
, Wet venting - correct answers -Causes siphoning of water out of p traps
1 pound of water - correct answers -1 btu will heat
Access - correct answers -Ready access or removal of panel, door, etc
Faucet - correct answers -What fixture uses an air break
Building sewer - correct answers -Yard line
Building Drain - correct answers -Under the building
Combination waste and vent system - correct answers -A specially designed system of waste piping
embodying the horizontal wet venting of one or more sinks or floor drains by means of a common waste
and vent pipe adequately sized to provide free movement of air above the flow line of the drain.
Combination Waste and Vent system - correct answers -Drain is acting as vent
Common vent - correct answers -A vent connecting at the junction of two fixture drains and serving as a
vent for both fixtures
Contamination - correct answers -An impairment of the quality of the potable water that creates an
actual hazard to the public health through poisoning or the spread of disease by sewage, industrial fluids
or waste
2
