A plumbing fitting designed with a U-shaped dip that retains a small amount of wastewater after a fixture is used. This standing water creates a physical barrier that prevents toxic and foul-smelling sewer gases from rising back up the drainpipe and entering the living space.
Heard on the job
The basement smells like methane because the floor drain stench trap dried out over the summer.
Also heard as
- trap
- P-trap
- U-bend