Oatey Sure-Vent 39018 Air Admittance Valve

1.5″ x 2″ Sure-Vent ABS Air Admittance Valve Oatey 39018

• 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

This valve’s sweet spot technology opens at -0.01 psi and seals at 0 psi and above, screening on air inlets to guard the seal. This one-way valve is designed to allow air to enter the plumbing drainage system when negative pressures develop in the piping system. This device shall close by gravity and seal the vent terminal at zero differential pressure (no flow conditions) and under positive internal pressures.