Pipe Whisperer or Clueless Dripper? Unclog Your Knowledge!The U-shaped bend in drainage systems that blocks sewer gases is called a:13%Next Correct Incorrect P-traps hold water to create a seal against gas backup. Standard under sinks/toilets. The U-shaped bend in drainage systems that blocks sewer gases is called a: Air admittance valve Siphon tube Flange adapter P-trap 13%
