Most People Fail This Plumbing Item Quiz—Can You Pass?

Which part helps stop sewer gas from coming back up?

75%

Correct!

Incorrect!

The curved P-trap pipe holds a small amount of water after each use. That water creates a seal that blocks sewer gases from traveling back up through the drain into the room.

Which part helps stop sewer gas from coming back up?

P-trap

Pipe elbow

Drain cover

Faucet supply line

75%