2" through 4" Air Admittance Valve with Connector

STUDOR® MAXI-VENT® Air Admittance Valve – High-Capacity Venting for 3" and 4" Systems

The STUDOR® MAXI-VENT®, model IPS 20302, is an engineered air admittance valve designed to provide stack, branch, or individual fixture venting without the need for roof penetrations. This valve supports drainage systems with capacities up to 500 drainage fixture units (DFUs), making it suitable for residential, commercial, and multi-story installations.

Constructed from durable ABS and equipped with a 4-inch push-fit rubber connector, the MAXI-VENT® simplifies installation while maintaining code compliance under most major plumbing standards. Its integral vermin guard ensures protection against pest intrusion, and the unit is optimized for venting performance in both positive and negative pressure events within the drainage system.

Key Features

• Application: Functions as a stack, circuit, branch, or individual vent
• Vent Capacity: Rated up to 500 DFUs in stack applications
• Compatibility: Fits 3" and 4" piping systems
• Material: ABS body with integrated vermin protection
• Connection: Supplied with 4" push-fit rubber adapter
• Installation: Suitable for vertical orientation; accessible location required

Technical Specifications

• Product Type: Air admittance valve
• Nominal Size: 3”/4”
• Dimensions: 3" ID x 4-7/8" OD x 5-1/4" length
• Material: ABS (valve body), EPDM (sealing components)
• Country of Origin: USA

Installation Guidelines

The MAXI-VENT® must be installed in an upright, vertical position and remain accessible for future inspection or replacement. It should be located at least 4 inches above the horizontal branch drain and must not be exposed to freezing temperatures. This product is designed for use in accordance with IPC, IRC, and other applicable plumbing codes that permit air admittance valves.

Use Cases

• Eliminating the need for through-the-roof venting
• Retrofitting existing systems to resolve venting issues
• New construction where traditional venting is impractical