3" x 4", PVC, 160 Branch, 500 Stack DFU, 1-Way, Air Admittance Valve with Schedule 40 Adapter
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For Use as a Secondary Vent; One Size Approved to Handle up to 4 Inch Vent Pipe; Opens/Closes as Needed by Building's Plumbing System
Air Admittance Valve; Type 1-Way; Inlet Size 3 to 4 Inch; Inlet Connection Threaded; Body Material PVC; Media Handled Air; Inclusions/Features Schedule 40 Adapter; Application Plumbing Drainage System; Applicable Standard ASSE 1050/1051, NSF 14 (Canada and US), ISO 9001, ICC ESR 1664, C-IAPMO; Lead-Free; Capacity 500 DFU
Sure-Vent® 500 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.
