Drain, Waste, and Vent (DWV) Systems Exam
Newest 2026 Questions and Correct Detailed
Answers Already Graded A+
the upward movement of liquid, such as the contents of a trap seal, through the
fibers or cellular structure of a material - CORRECT ANSWER-capillary
attraction
a fitting with a removable cap or plug installed in sanitary drainage piping to allow
access to the piping - CORRECT ANSWER-cleanout
the highest point on the internal bottom surface of the crown of a plumbing trap -
CORRECT ANSWER-crown weir
collects and combines the flow from two opposite runs into one run of pipe -
CORRECT ANSWER-double 1⁄4 bend
when one trap is attached to another and causes drainage issues because air
becomes trapped - CORRECT ANSWER-double trapping
, a coupling that connects two different sized pipes - CORRECT ANSWER-
adapter
a backflow condition caused by downstream pressure in the water distribution
pipe being higher than the water supply pressure - CORRECT ANSWER-back
pressure
another name for back pressure - CORRECT ANSWER-backpressure backflow
the part of a drainage system that extends from the end of the building drain and
conveys its discharge to the public sewer, private sewer, individual sewage-
disposal system, or other point of disposal - CORRECT ANSWER-building sewer
a vertical length of stack at least 8 feet high within which the horizontal branches
from one story or floor of the building are connected to the stack - CORRECT
ANSWER-branch interval
removes waste from a building via multiple types of fittings - CORRECT
ANSWER-drainage fitting
system that removes sewage and greywater from a building, and regulates air
pressure in the waste-system pipes to aid free flow - CORRECT ANSWER-DWV
system
Newest 2026 Questions and Correct Detailed
Answers Already Graded A+
the upward movement of liquid, such as the contents of a trap seal, through the
fibers or cellular structure of a material - CORRECT ANSWER-capillary
attraction
a fitting with a removable cap or plug installed in sanitary drainage piping to allow
access to the piping - CORRECT ANSWER-cleanout
the highest point on the internal bottom surface of the crown of a plumbing trap -
CORRECT ANSWER-crown weir
collects and combines the flow from two opposite runs into one run of pipe -
CORRECT ANSWER-double 1⁄4 bend
when one trap is attached to another and causes drainage issues because air
becomes trapped - CORRECT ANSWER-double trapping
, a coupling that connects two different sized pipes - CORRECT ANSWER-
adapter
a backflow condition caused by downstream pressure in the water distribution
pipe being higher than the water supply pressure - CORRECT ANSWER-back
pressure
another name for back pressure - CORRECT ANSWER-backpressure backflow
the part of a drainage system that extends from the end of the building drain and
conveys its discharge to the public sewer, private sewer, individual sewage-
disposal system, or other point of disposal - CORRECT ANSWER-building sewer
a vertical length of stack at least 8 feet high within which the horizontal branches
from one story or floor of the building are connected to the stack - CORRECT
ANSWER-branch interval
removes waste from a building via multiple types of fittings - CORRECT
ANSWER-drainage fitting
system that removes sewage and greywater from a building, and regulates air
pressure in the waste-system pipes to aid free flow - CORRECT ANSWER-DWV
system
