The sink trap retains a small amount of water after the fixture is used. This water in the trap creates a seal that prevents sewer gas from passing from the drain pipes back into the occupied space of the home or building.
How does a sink trap work?
The sink trap retains a small amount of water after the fixture is used. This water in the trap creates a seal that prevents sewer gas from passing from the drain pipes back into the occupied space of the home or building.