Pipe Whisperer or Clueless Dripper? Unclog Your Knowledge!In drains, an Air Admittance Valve (AAV) balances pressure by:93%Next Correct Incorrect AAVs open under negative pressure to prevent P-trap seal loss and gurgling. In drains, an Air Admittance Valve (AAV) balances pressure by: Breaking vacuum seals Venting to atmosphere Admitting air during vacuum Releasing excess pressure 93%
