Oatey® Sure-Vent® 20 DFU (Drain Fixture Units) Capacity Air Admittance Valve's one-way valve allows air to enter the plumbing drainage system when negative pressures develop in the piping system.

• Complies to ASSE Standard 1050 and 1051
• For use as a secondary vent
• One size approved to handle up to 3" vent pipe
• Opens/closes as needed by building's plumbing system