--- product_id: 370093403 title: "20302 Maxi-Vent 3-Inch to 4-Inch Air Admittance Valve" brand: "studor" price: "Β₯23423" currency: JPY in_stock: true reviews_count: 5 category: "Studor" url: https://www.desertcart.jp/products/370093403-20302-maxi-vent-3-inch-to-4-inch-air-admittance store_origin: JP region: Japan --- # Meets ASSE, NSF & IAPMO standards Vents up to 500 DFU Durable ABS plastic build 20302 Maxi-Vent 3-Inch to 4-Inch Air Admittance Valve **Brand:** studor **Price:** Β₯23423 **Availability:** βœ… In Stock ## Summary > 🌟 Elevate your plumbing game with Maxi-Vent β€” the silent hero your system deserves! ## Quick Answers - **What is this?** 20302 Maxi-Vent 3-Inch to 4-Inch Air Admittance Valve by studor - **How much does it cost?** Β₯23423 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/370093403-20302-maxi-vent-3-inch-to-4-inch-air-admittance) ## 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 - β€’ **Odor Control Ready:** Optional replaceable carbon filter reduces unpleasant plumbing odors for a fresher environment - β€’ **Cost-Saving Installation:** Eliminates need for roof penetrations and complex vent pipingβ€”streamline your setup - β€’ **Premium ABS Construction:** Engineered for durability and long-lasting performance in your plumbing system - β€’ **Certified Quality Assurance:** Complies with top industry standards including ASSE 10510, NSF 14, and IAPMO for peace of mind - β€’ **Maximize Venting Efficiency:** Supports up to 500 Drain Fixture Units for powerful pressure equalization ## Overview The 20302 Maxi-Vent Air Admittance Valve is a high-performance plumbing accessory designed to equalize pressure in DWV systems by venting up to 500 DFUs. Constructed from durable ABS plastic and certified to rigorous ASSE, NSF, and IAPMO standards, it simplifies installation by eliminating roof penetrations and vent piping. Ideal for single fixtures, branches, or stack applications, it also offers an optional carbon filter to reduce odors, making it a smart, efficient upgrade for modern plumbing systems. ## 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: Needed Review: Toll - 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 | | ASIN | B000NID704 | | Batteries Included? | No | | Batteries Required? | No | | Best Sellers Rank | #89,218 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #235 in Registers, Grilles & Vents | | Color | White | | Customer Reviews | 4.6 4.6 out of 5 stars (185) | | Customer reviews | 4.6 4.6 out of 5 stars (185) | | Date First Available | 15 September 2013 | | Date First Available | 15 September 2013 | | Included components | IPS STUDOR MAXI VENT | | Item Package Quantity | 1 | | Item Weight | 249 g | | Item model number | GIDDS-301050 | | Item model number | GIDDS-301050 | | Manufacturer | Alfi | | Manufacturer | Alfi | | Material | Acrylonitrile Butadiene Styrene | | Part number | GID-301050 | | Product Dimensions | 8.89 x 8.89 x 15.24 cm; 249.48 g | | Product Dimensions | 8.89 x 8.89 x 15.24 cm; 249.48 g | | Size | 5-1/4 inche | | Specification met | ASSE, IAPMO, NSF | ## Images ![20302 Maxi-Vent 3-Inch to 4-Inch Air Admittance Valve - Image 1](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 ### ⭐⭐⭐⭐⭐ Needed *by S***P on 11 August 2023* ### ⭐⭐⭐⭐⭐ Toll *by W***N on 6 December 2025* Supi ### ⭐⭐⭐⭐⭐ As advertised *by S***L on 16 March 2025* ## 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 --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/370093403-20302-maxi-vent-3-inch-to-4-inch-air-admittance](https://www.desertcart.jp/products/370093403-20302-maxi-vent-3-inch-to-4-inch-air-admittance) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-08-04*