MASTER PLUMBING WSSC ASSESSMENT
SCRIPT 2026 VERIFIED ANSWERS
COMPREHENSIVE REVIEW
◉ Individual Vent
Answer: A pipe installed to vent a fixture trap. It may connect to the
vent system above the fixture or terminate in the open air.
◉ Main
Answer: Is the primary or principal pipe that drains through an air
gap to the drainage system.
◉ Potable Water
Answer: Is water that is sufficiently free of impurities to meet public
health standards.
◉ Rough In
Answer: Parts of the plumbing system that are installed
prior to the installation of fixtures.
◉ Soil Pipe
Answer: Is drain pipe conveying sewage containing fecal matter.
,◉ Stack Vent
Answer: Is the extension of a soil or waste stack above the highest
fixture served.
◉ Trap
Answer: Is a device that provides a water seal to prevent the passage
of sewer gas and allow the passage of waste.
◉ Trap Seal
Answer: Distance from weir to top of the dip of the trap
◉ Vacuum Breaker
Answer: Is a backflow preventer that allows air to a vacuum being
pulled on a system.
◉ Vent Stack
Answer: A vertical vent pipe to provide circulation of air to and from
drainage system
◉ Vertical Pipe
Answer: Pipe that makes an angle of 45 degrees or more with the
horizontal.
, ◉ No do this
Answer: No dangerous, flammable, poisonous, or explosive liquids
shall be deposited in to the drainage system.
◉ Pipes shall be
Answer: Pipes shall be protected from breakage when passing under
or though walls.
◉ Trenches
Answer: Trenches installed parallel to footings shall not extend
below the 45-degree bearing plane of the wall or footing.
◉ Copper
Answer: Copper must be supported horizontally - 6 feet or closer on
small piping and 10 feet on 1 1/2" or larger piping.
◉ Drainage Pipe Test
Answer: Drainage pipe shall be tested with a 10 foot head of water
or air at 5 psi.
◉ Plumbing Fixtures
Answer: Must be made of approved, smooth, impervious material.
SCRIPT 2026 VERIFIED ANSWERS
COMPREHENSIVE REVIEW
◉ Individual Vent
Answer: A pipe installed to vent a fixture trap. It may connect to the
vent system above the fixture or terminate in the open air.
◉ Main
Answer: Is the primary or principal pipe that drains through an air
gap to the drainage system.
◉ Potable Water
Answer: Is water that is sufficiently free of impurities to meet public
health standards.
◉ Rough In
Answer: Parts of the plumbing system that are installed
prior to the installation of fixtures.
◉ Soil Pipe
Answer: Is drain pipe conveying sewage containing fecal matter.
,◉ Stack Vent
Answer: Is the extension of a soil or waste stack above the highest
fixture served.
◉ Trap
Answer: Is a device that provides a water seal to prevent the passage
of sewer gas and allow the passage of waste.
◉ Trap Seal
Answer: Distance from weir to top of the dip of the trap
◉ Vacuum Breaker
Answer: Is a backflow preventer that allows air to a vacuum being
pulled on a system.
◉ Vent Stack
Answer: A vertical vent pipe to provide circulation of air to and from
drainage system
◉ Vertical Pipe
Answer: Pipe that makes an angle of 45 degrees or more with the
horizontal.
, ◉ No do this
Answer: No dangerous, flammable, poisonous, or explosive liquids
shall be deposited in to the drainage system.
◉ Pipes shall be
Answer: Pipes shall be protected from breakage when passing under
or though walls.
◉ Trenches
Answer: Trenches installed parallel to footings shall not extend
below the 45-degree bearing plane of the wall or footing.
◉ Copper
Answer: Copper must be supported horizontally - 6 feet or closer on
small piping and 10 feet on 1 1/2" or larger piping.
◉ Drainage Pipe Test
Answer: Drainage pipe shall be tested with a 10 foot head of water
or air at 5 psi.
◉ Plumbing Fixtures
Answer: Must be made of approved, smooth, impervious material.
