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Rated 20 DFU's for venting DWV 2 in and smaller
Sweet Spot(TM) technology opens at -0.01 psi and seals at 0 psi and above Screening on air inlets to guard the seal
Protective rubber sleeve provides grip for installation and keeps valve free from debris
100% functionally tested at 1/4 in H2O and 30 in H2O ensuring trouble-free performance
For use as a secondary vent
One size approved to handle up to 3 in vent pipe