a vent pipe that is wet because is also conveys drainage
a vent that is also used as a drain
Drain or waste pipe that also acts for one or more fixtures on the same line.
A wet vent is a vent that also serves as a drain.
"Wet vent" means a vent which also serves as a drain.
Pipe which rids a building of unwanted substances such as hazardous and non-hazardous liquids and solids. It is also called a fixture branch, fixture drain, and waste pipe.
A vent that receives the discharge of waste other than from water closets.