Auto Vents aka Air Admittance Valves for Plumbing
How to Install an Air Admittance Valve
Allow 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 carbon filter to reduce plumbing drainage system odors.
Studor 20302 Maxi-Vent 3-Inch to 4-Inch Air Admittance Valve
Studor 20302 Maxi-Vent 3-Inch to 4-Inch Air Admittance Valve : Industrial & Scientific
Oatey Air Admittance Valve
Auto Vents aka Air Admittance Valves for Plumbing
CodeNotes: Installation of air admittance valves - ICC
Waste Plumbing: Air Admittance Valves and Automatic Air Vents – Part Two - Home Inspection Training
Plastic Air Admittance Valve
Keeney Plastic Air Admittance Valve
Buy Air Admittance Valves, Durgo Valve