---
product_id: 89890486
title: "Studor 20302 Maxi-Vent 3-Inch to 4-Inch Air Admittance Valve"
brand: "studor"
price: "¥29085"
currency: JPY
in_stock: true
reviews_count: 5
category: "Studor"
url: https://www.desertcart.jp/products/89890486-studor-20302-maxi-vent-3-inch-to-4-inch-air
store_origin: JP
region: Japan
---

# Fits 3- to 4-inch pipes Vents up to 500 DFUs Durable ABS plastic build Studor 20302 Maxi-Vent 3-Inch to 4-Inch Air Admittance Valve

**Brand:** studor
**Price:** ¥29085
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate your plumbing game—vent smarter, not harder!

## Quick Answers

- **What is this?** Studor 20302 Maxi-Vent 3-Inch to 4-Inch Air Admittance Valve by studor
- **How much does it cost?** ¥29085 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/89890486-studor-20302-maxi-vent-3-inch-to-4-inch-air)

## Best For

- studor enthusiasts

## Why This Product

- Trusted studor brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Crafted from high-grade ABS plastic for long-lasting, corrosion-resistant performance.
- • **Compact & Versatile:** Designed to fit 3- to 4-inch pipe sizes, perfect for diverse plumbing setups.
- • **Odor Control Upgrade:** Optional replaceable carbon filter reduces unpleasant drainage odors for a fresher environment.
- • **Certified Peace of Mind:** Meets ASSE, NSF, and IAPMO standards ensuring reliable, code-compliant operation.
- • **Maximize Venting Efficiency:** Supports single fixtures, branches, circuits, and stacks up to 500 DFUs—no roof penetrations needed.

## Overview

The Studor 20302 Maxi-Vent is a high-performance air admittance valve designed for 3- to 4-inch pipes, venting up to 500 DFUs. Made from durable ABS plastic and certified by ASSE, NSF, and IAPMO, it eliminates costly roof penetrations while ensuring efficient pressure equalization in drainage systems. Optional carbon filters enhance odor control, making it a must-have for modern, hassle-free plumbing solutions.

## Description

Allow air to enter DWV systems to equalize pressure when water drains out of the system; eliminate the need for costly roof penetrations and vent piping. 1ATD5 vents up to 500 DFUs on a stack; 1ATD6 vents up to 160 DFUs on a branch and up to 24 DFUs on a stack. 15W940 has a replaceable cabon filter to reduce plumbing drainage system odors.

Review: Perfect stink pipe
Review: Supi

## Features

- For use with: Venting Single Fixture, Individual Branch, Circuit Vent Or Stack Type Application Up To 500 DFU
- Material of Construction: ABS Plastic
- Standards: ASSE Performance Standard 10510 And 1051, NES-592, NSF Standard 14, IAPMO, File No C-3803, ITS Intertek Testing Services

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000NID704 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 1,279,733 in DIY & Tools ( See Top 100 in DIY & Tools ) 9,572 in Central Heating System Accessories |
| Certification | ASSE, IAPMO, NSF |
| Colour | White |
| Customer Reviews | 4.6 4.6 out of 5 stars (185) |
| Date First Available | 15 Sept. 2013 |
| Item Package Quantity | 1 |
| Item Weight | 249 g |
| Item model number | GIDDS-301050 |
| Manufacturer | Alfi |
| Material | Acrylonitrile Butadiene Styrene |
| Part Number | GID-301050 |
| Product Dimensions | 8.89 x 8.89 x 15.24 cm; 249.48 g |
| Size | 5-1/4 inche |

## Images

![Studor 20302 Maxi-Vent 3-Inch to 4-Inch Air Admittance Valve - Image 1](https://m.media-amazon.com/images/I/41EdVZ4aerL.jpg)
![Studor 20302 Maxi-Vent 3-Inch to 4-Inch Air Admittance Valve - Image 2](https://m.media-amazon.com/images/I/51Zq1PXutjL.jpg)

## Questions & Answers

**Q: So can this vent inside a basement with no odor? We bought a house that has zero roof vents. Can this be used in place of those?**
A: Don't think I 'd iinstall it in the basement.  It needs to be above the fixture(s)  that it vents.  I've used smaller AAVs for indivuaul fixtures and placed them under the cabinet/sink or in the wall.  The larger AAVs are desgined to handle several fixtures and replace the need for a large vent that penetrates the roof.  These I've placed in the attack (below the roof but inside the building) and have not had any problems.

**Q: How long does one of these last until it needs to be replaced? Is there a way to tell if it has failed besides escaped sewer gas smell?**
A: Package shows limited lifetime warranty. I assume when you smell sewer gasses, it has failed, but I really don't expect it to fail. All I know, is that it works and so far, I'm very pleased with the performance.

**Q: Does it come with a push-fit connector donut (wide o-ring) for connecting to inside of 4" pipe? Shown on spec sheet, but not for item.**
A: No… just the item. Fits inside 4” sch 40 PVC coupling or 4” Fernco rubber coupling

**Q: Is it acceptable to use a rubber boot?**
A: This goes INSIDE the attic. No boot needed.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by S***P on 11 August 2023*

Perfect stink pipe

### ⭐⭐⭐⭐⭐ Review
*by W***N on 6 December 2025*

Supi

### ⭐⭐⭐⭐⭐ Review
*by S***L on 16 March 2025*

Fits and works perfectly

## Frequently Bought Together

- Studor 20302 Maxi-Vent 3-Inch to 4-Inch Air Admittance Valve
- Studor 20341 Mini-Vent Air Admittance Valve with PVC Adapter, 1-1/2- or 2-Inch Connection
- Oatey Sure-Vent 1-1/2 in.–2 in. 160 Branch, 24 Stack DFU Air Admittance Valve with White PVC Sch. 40 Adapter

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-08*