UNIFORM PLUMBING CODE EXAM QUESTIONS WITH CORRECT ANSWERS LATEST UPDATE 2026
Building drain - Answers That part of the lowest piping of a drainage system that receives the
discharge from soil, waste and other drainage pipes inside the wall of a building and conveys it to a
point 2 feet outside the building wall.
Combination waste and vent system - Answers A horizontal drain that is to provide free movement of
air above the flow line of the drain.
Flushometer Tank - Answers A device integrated within an air accumulator vessel that is designed to
discharge a predetermined quantity of water to fixtures for flushing purposes.
Wet vent - Answers A vent that is also a drain
The vertical depth of a trap seal is measured from - Answers The crown weir to the top of the dip of
the trap
True or false: restroom facilities in a day care are classified as public use - Answers True
A combination sewer is _________________. - Answers Building sewer that conveys both sewage and
storm water
Invert - Answers Lowest portion of the inside of a horizontal pipe
Trap primer - Answers A device and system of piping that maintains a water seal in a remote trap
Soldered joint - Answers Joint obtained by the joining of metal parts with metallic mixtures or alloys
that melt at a temp up to 840 degrees F
Building sub-drain - Answers The portion of a drainage system that does not drain by gravity into the
building sewer
Boiler blow-off - Answers An outlet on a boiler to permit emptying or discharging of sediment
Backwater Valve - Answers A device installed in a drainage system to prevent reverse flow
A connection to public sewer or private sewage is required for - Answers Buildings with plumbing
fixtures
Piping, fixtures, or equipment that are installed so that they interfere with normal operation and use
of windows or doors shall be - Answers Relocated to avoid interference
When supporting horizontal piping 5" in diameter with hangers, ———-" diameter rod shall be used. -
Answers 1/2"
All trenches deeper than the footing of any building or structure and paralleling the same must be at
least - Answers 45 degrees therefrom
Threaded pipe I.P.S. 3/4" (except gas piping) installed horizontally shall be supported - Answers In 10
foot intervals
I.P.S. Is an abbreviation for - Answers Iron pipe size
Copper tubing installed vertically shall be supported at each story or at maximum intervals of -
Answers 10 feet
2" horizontal copper tubing drain pipe shall be supported at - Answers 10 foot intervals
Wiped joints are permitted with - Answers Lead
Tub waste openings in framed construction shall be protected by - Answers Metal collars or screens
Closet bends or stubs shall be cut-off to be even with the top of the _______. - Answers Closet ring
Joints at the roof, around pipes, shall be made watertight by the use of - Answers Flashing material
Wall mounted water closets shall be securely bolted to - Answers A carrier fitting
Fixture connections between drainage pipes and water closets shall be made with - Answers Flanges
Sleeves shall be provided to protect all piping through - Answers Concrete and masonry
Test gauges shall not hve a pressure more than ——— the test pressure - Answers Twice
Screws or bolts for securing floor mounted fixtures shall be - Answers Brass
The overflow pipe from a fixture shall be connected on the - Answers House or inlet side of a fixture
trap
The diameter of a waste and overflow for a bathtub shall not be less than - Answers 1.5" OD
The connection of a dishwasher drain directly to the continuous waste is - Answers A code violation
Trough urinals shall he - Answers Prohibited
With two noted exceptions, all shower compartments and receptors shall be capable of encompassing
a _______ diameter circle. - Answers 30"
Joints in copper shower pan liners shall be - Answers Soldered or brazed
Water closets set side by side shall be no closer than - Answers 30" center to center
Manually controlled flushometer valves may be substituted for - Answers One urinal
The joint of a wall-hung lavatory, where it is in contact with the wall, shall be - Answers Watertight
Building drain - Answers That part of the lowest piping of a drainage system that receives the
discharge from soil, waste and other drainage pipes inside the wall of a building and conveys it to a
point 2 feet outside the building wall.
Combination waste and vent system - Answers A horizontal drain that is to provide free movement of
air above the flow line of the drain.
Flushometer Tank - Answers A device integrated within an air accumulator vessel that is designed to
discharge a predetermined quantity of water to fixtures for flushing purposes.
Wet vent - Answers A vent that is also a drain
The vertical depth of a trap seal is measured from - Answers The crown weir to the top of the dip of
the trap
True or false: restroom facilities in a day care are classified as public use - Answers True
A combination sewer is _________________. - Answers Building sewer that conveys both sewage and
storm water
Invert - Answers Lowest portion of the inside of a horizontal pipe
Trap primer - Answers A device and system of piping that maintains a water seal in a remote trap
Soldered joint - Answers Joint obtained by the joining of metal parts with metallic mixtures or alloys
that melt at a temp up to 840 degrees F
Building sub-drain - Answers The portion of a drainage system that does not drain by gravity into the
building sewer
Boiler blow-off - Answers An outlet on a boiler to permit emptying or discharging of sediment
Backwater Valve - Answers A device installed in a drainage system to prevent reverse flow
A connection to public sewer or private sewage is required for - Answers Buildings with plumbing
fixtures
Piping, fixtures, or equipment that are installed so that they interfere with normal operation and use
of windows or doors shall be - Answers Relocated to avoid interference
When supporting horizontal piping 5" in diameter with hangers, ———-" diameter rod shall be used. -
Answers 1/2"
All trenches deeper than the footing of any building or structure and paralleling the same must be at
least - Answers 45 degrees therefrom
Threaded pipe I.P.S. 3/4" (except gas piping) installed horizontally shall be supported - Answers In 10
foot intervals
I.P.S. Is an abbreviation for - Answers Iron pipe size
Copper tubing installed vertically shall be supported at each story or at maximum intervals of -
Answers 10 feet
2" horizontal copper tubing drain pipe shall be supported at - Answers 10 foot intervals
Wiped joints are permitted with - Answers Lead
Tub waste openings in framed construction shall be protected by - Answers Metal collars or screens
Closet bends or stubs shall be cut-off to be even with the top of the _______. - Answers Closet ring
Joints at the roof, around pipes, shall be made watertight by the use of - Answers Flashing material
Wall mounted water closets shall be securely bolted to - Answers A carrier fitting
Fixture connections between drainage pipes and water closets shall be made with - Answers Flanges
Sleeves shall be provided to protect all piping through - Answers Concrete and masonry
Test gauges shall not hve a pressure more than ——— the test pressure - Answers Twice
Screws or bolts for securing floor mounted fixtures shall be - Answers Brass
The overflow pipe from a fixture shall be connected on the - Answers House or inlet side of a fixture
trap
The diameter of a waste and overflow for a bathtub shall not be less than - Answers 1.5" OD
The connection of a dishwasher drain directly to the continuous waste is - Answers A code violation
Trough urinals shall he - Answers Prohibited
With two noted exceptions, all shower compartments and receptors shall be capable of encompassing
a _______ diameter circle. - Answers 30"
Joints in copper shower pan liners shall be - Answers Soldered or brazed
Water closets set side by side shall be no closer than - Answers 30" center to center
Manually controlled flushometer valves may be substituted for - Answers One urinal
The joint of a wall-hung lavatory, where it is in contact with the wall, shall be - Answers Watertight
