Studor 20302 air admittance valve

Studor 20302 air admittance valve

The Studor 20302 is an air admittance valve designed for plumbing drainage systems. It allows air to enter the pipe when negative pressure occurs, preventing trap siphonage without a traditional vent stack. The unit fits 3 in and 4 in pipe and drain sizes with a slip connection. It meets ANSI/ASSE 1050 and 1051 standards.

Installation uses a slip connection on 3 in

Installation is straightforward using the slip connection on compatible 3 in or 4 in pipes. No specialised tools are required beyond standard plumbing supplies. Common issues include ensuring the valve is accessible for maintenance and verifying local code acceptance, as some jurisdictions restrict air admittance valve use.

Handles venting for 3 in and 4 in drainage lines

The valve provides venting capacity for 3 in and 4 in drainage lines, balancing pressure during fixture discharge. It runs out of capacity if installed on pipe sizes outside the 3 in to 4 in range or where local codes prohibit air admittance valves entirely. The silicone membrane and ABS construction resist corrosion in normal drain environments.