Venting Air Admittance Valves Durgo US90 P-3704 3-inch (Maxi) Large Home and...
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Durgo US90 P-3704 3-inch (Maxi) Large Home and Commercial 160 DFUs

Price: $32.11
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 US90 AAVs accommodate 3" pipe.
Tested to work effectively in temperatures ranging from -40 to 150 degrees Fahrenheit
Valves open at -0.01 psi and seal at 0 psi and above.
Lifetime warranty