Studor 20346 Redi Vent, White

"Oatey Sure-Vent 160 DFU Capacity Air Admittance Valve's one-way valve is designed to allow air to enter the plumbing drainage system when negative pressures develop in the piping system.The purpose of an Air Admittance Valve is to provide a method of allowing air to enter the plumbing drainage system without the use of a vent extended to open air and to prevent sewer gases from escaping into a building. An Air Admittance Valve is a one way valve designed to allow air to enter the plumbing drainage system when negative pressures develop in the piping system. The device shall close by gravity and seal the vent terminal at zero differential pressure (no flow conditions) and under positive internal pressures."

Sure-Vent air admittance valve with PVC Sch. 40 adapter
Use as an alternative to a secondary vent in a DWV system
Vents up to 160 DFU Branch or 24 DFU Stack
One size approved to handle 1-1/2 in.–2 in. vent pipe
Protective 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
Complies to ASSE Standard 1050 and 1051. International Plumbing Code (IPC) and Uniform Plumbing Code (UPC) approved
Sure-Vent air admittance valve with PVC Sch. 40 adapter
Use as an alternative to a secondary vent in a DWV system
Vents up to 160 DFU Branch or 24 DFU Stack
One size approved to handle 1-1/2 in.–2 in. vent pipe
Protective 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
Complies to ASSE Standard 1050 and 1051. International Plumbing Code (IPC) and Uniform Plumbing Code (UPC) approved

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Oatey Sure-Vent 1-1/2 in.–2 in. 160 Branch, 24 Stack DFU Air Admittance Valve with White PVC Sch. 40 Adapter;