21.
A vertical pipe that is connected to the drainage system and usually protrudes through the roof is known as what?
A
Lifter
B
Stem
C
Riser
D
Shaft
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A vertical pipe that is connected to the drainage system and usually protrudes through the roof is known as what?
Lifter
Stem
Riser
Shaft
A valve used to tap into an existing pipe is known as what?
Wet valve
Pressure valve
Saddle valve
Tie valve
A fitting that sits inside the hub of another fitting to reduce its size or alter its interior is known as what?
Seal
Flange
Washer
Bushing
A fitting that allows a secondary pipe to branch off a main pipe is known as what?
C fitting
T fitting
L fitting
I fitting
The fresh water supply, sewage lines and ventilation in new building construction is commonly known as what?
W.V.D
W.D.V
D.W.V
V.D.W