Brand: STUDOR by IPS Corporation | Manufacturer Part Number: 20302 | Big Frog Supply SKU: 20302
Product Overview
The STUDOR Maxi-Vent 20302 is an air admittance valve for compatible 3-inch and 4-inch drain, waste, and vent systems. It can serve as an individual, branch, circuit, or stack vent where approved by the applicable plumbing code. When a fixture discharges and creates negative pressure in the drainage system, the one-way valve opens to admit air. When flow stops and pressure equalizes, gravity closes the valve to help prevent sewer gases from circulating back through the vent opening.
The Maxi-Vent can vent up to 500 drainage fixture units on a stack when the system is designed and installed according to STUDOR guidance and local code. It fits a 3-inch connection with a compatible no-hub-type coupling and a 4-inch pipe using the provided push-fit rubber connector or gasket arrangement. The valve includes an exclusive vermin-protection system and is intended for residential or commercial use. An air admittance valve does not eliminate every conventional venting requirement; system design, access, placement, airflow, and code approval must be confirmed before installation.
Key Features
- Air admittance valve for 3-inch or 4-inch DWV piping
- Suitable as an individual, branch, circuit, or stack vent where approved
- Vents up to 500 DFUs on a stack
- Opens automatically during negative pressure
- Gravity-closing one-way valve
- Exclusive vermin-protection system
- Residential or commercial application
Common Uses
- DWV stack venting
- Branch and circuit venting
- Projects where an approved AAV can reduce roof penetrations
- Residential and commercial drainage systems
Technical Specifications
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Manufacturer model: 20302
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Compatible pipe sizes: 3 inches and 4 inches
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Maximum stack capacity: Up to 500 DFUs
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Valve body: ABS
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Approximate overall height: 5-1/4 inches
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Approximate overall diameter: 4-7/8 inches
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Standards/listings: ANSI/ASSE 1050 and 1051, NSF 14, ETL, ICC-ES PMG-1025, and applicable listed approvals
Installation Notes
Install vertically and in an accessible location that permits airflow and future inspection. Follow required elevation and placement rules relative to the connected piping and insulation. Confirm that air admittance valves are permitted for the application by local code. Use only connection and sealing methods approved by STUDOR; improper chemicals or installation can damage the valve or void warranty coverage.
Frequently Asked Questions
Does the Maxi-Vent fit both 3-inch and 4-inch pipe?
Yes. Model 20302 is designed for compatible 3-inch and 4-inch connections using the appropriate coupling or supplied gasket arrangement.
How much can it vent?
STUDOR lists the Maxi-Vent for up to 500 DFUs on a stack when correctly designed and installed.
Can it replace every roof vent?
No. Local code and the complete DWV system design determine where an air admittance valve is permitted and what conventional venting must remain.
Why Buy This Product from Big Frog Supply?
The STUDOR 20302 is the larger Maxi-Vent for 3- and 4-inch DWV systems, not a small fixture-only valve. Big Frog Supply clearly identifies its pipe sizes, stack capacity, connection requirements, and code-dependent use so customers can confirm the correct vent before ordering.
