MASTER PLUMBING WSSC 2026
CERTIFICATION EVALUATION QUESTIONS
AND COMPLETE SOLUTIONS FULL STUDY
GUIDE GRADED A+
⩥ Before work commences when must a permit be obtained?
Answer: A permit must be obtained or a 100% (Double the normal fee)
will be charged.
⩥ Underground Piping
Answer: All underground piping shall be left uncovered until inspected.
⩥ Inspector's Authority
Answer: The inspector has authority to stop work being done
dangerously or unsafely.
⩥ Air Gap
Answer: The vertical distance between the opening of the water supply
and flood level rim of a receptacle.
⩥ Branch
Answer: Any part of the piping system except mains, stacks or risers.
,⩥ Branch Vent
Answer: A vent connecting individual vents with a stack vent or vent
stack.
⩥ Building Drain
Answer: The lowest part of a drainage system which receives waste
from soil and waste pipes and connects to the building sewer.
⩥ Building Sewer
Answer: Drainage piping that conveys waste from the building drain to
the public sewer or disposal system.
⩥ Cleanout
Answer: Access opening in the drainage system used to remove
obstructions.
⩥ Combination Fixture
Answer: Two or three compartment sink drained by a continuous waste
connected to one trap.
⩥ Combinate Waste and Vent System
Answer: Horizontal wet venting system for sinks and floor drains.
, ⩥ Common Vent
Answer: A single vent serving as the vent for two fixture drains.
⩥ Critical Level
Answer: Is an elevation mark on a vacuum breaker setting the minimum
elevation device can be installed above the flood level rim of a fixture.
⩥ Cross Connection
Answer: Is an actual or potential tie between potable water and any
source of pollution or contamination.
⩥ Developed Length
Answer: A measurement of piping taken along the centerline of pipe and
fittings
⩥ Drain
Answer: any pipe that conveys waste water in the drainage system.
⩥ Indirect Waste
Answer: Waste pipe that drains through an air gap to the drainage
system.
CERTIFICATION EVALUATION QUESTIONS
AND COMPLETE SOLUTIONS FULL STUDY
GUIDE GRADED A+
⩥ Before work commences when must a permit be obtained?
Answer: A permit must be obtained or a 100% (Double the normal fee)
will be charged.
⩥ Underground Piping
Answer: All underground piping shall be left uncovered until inspected.
⩥ Inspector's Authority
Answer: The inspector has authority to stop work being done
dangerously or unsafely.
⩥ Air Gap
Answer: The vertical distance between the opening of the water supply
and flood level rim of a receptacle.
⩥ Branch
Answer: Any part of the piping system except mains, stacks or risers.
,⩥ Branch Vent
Answer: A vent connecting individual vents with a stack vent or vent
stack.
⩥ Building Drain
Answer: The lowest part of a drainage system which receives waste
from soil and waste pipes and connects to the building sewer.
⩥ Building Sewer
Answer: Drainage piping that conveys waste from the building drain to
the public sewer or disposal system.
⩥ Cleanout
Answer: Access opening in the drainage system used to remove
obstructions.
⩥ Combination Fixture
Answer: Two or three compartment sink drained by a continuous waste
connected to one trap.
⩥ Combinate Waste and Vent System
Answer: Horizontal wet venting system for sinks and floor drains.
, ⩥ Common Vent
Answer: A single vent serving as the vent for two fixture drains.
⩥ Critical Level
Answer: Is an elevation mark on a vacuum breaker setting the minimum
elevation device can be installed above the flood level rim of a fixture.
⩥ Cross Connection
Answer: Is an actual or potential tie between potable water and any
source of pollution or contamination.
⩥ Developed Length
Answer: A measurement of piping taken along the centerline of pipe and
fittings
⩥ Drain
Answer: any pipe that conveys waste water in the drainage system.
⩥ Indirect Waste
Answer: Waste pipe that drains through an air gap to the drainage
system.
