Air Admittance Valve, Pipe Dia 3 To 4 In

Air Admittance Valve, Pipe Dia 3 To 4 In

Air Admittance Valve, ABS Plastic, White Color/Finish, Pipe Dia. 3-4 In., For Use With PVC or ABS, Slip Connection Air Admittance ValvesAllow air to enter DWV systems to equalize pressure when water drains out of the system; eliminate the need for costly roof penetrations and vent piping. 1ATD5 vents up to 500 DFUs on a stack; 1ATD6 vents up to 160 DFUs on a branch and up to 24 DFUs on a stack. 15W940 has a replaceable cabon filter to reduce plumbing drainage system odors.1ATD5 and 1ATD6 meet ASSE 1050/1051 and NSF 14.Use as individual, branch, circuit, or stack vents