# Oatey 500 DFU Air Admittance Valve 3-4 Inch PVC Schedule 40 Adapter | ASSE 1050 & 1051 Compliant **Brand:** Oatey **SKU:** mvp6994 **ASIN:** B001GTVK62 **Canonical URL:** https://crowcrowcrow.com/p/oatey-air-admittance-valve-3in-4in-500-dfu-39223-1-each/mvp6994 **Subcategory:** Categories **Availability:** in_stock **Price (INR, all-inclusive):** ₹5,231 **Discount:** 40% **Customer rating:** 4.60/5 from 182 ratings ## Description Oatey 500 DFU Air Admittance Valve (3-4 Inch PVC Schedule 40 Adapter) ensures proper plumbing ventilation. Complies with ASSE 1050/1051, handles up to 4" vent pipe, and opens/closes automatically. Imported from USA, all duties included. ## Highlights - ASSE Standard Compliance — Meets ASSE 1050 and 1051 standards, ensuring reliable performance and safety for secondary venting applications in plumbing systems. - Handles Up to 4" Vent Pipe — Versatile design accommodates vent pipes up to 4 inches in diameter, making it suitable for a wide range of residential and commercial plumbing setups. - Automatic Operation — Opens to release sewer gases when negative pressure occurs and closes when pressure normalizes, preventing trap seal siphoning and odor escape. - 500 DFU Capacity — Rated for 500 Drainage Fixture Units (DFU) for venting DWV systems up to 4 inches and smaller, providing ample capacity for most household needs. ## Key features - Complies to ASSE Standard 1050 and 1051 - For use as a secondary vent - One size approved to handle up to 4" vent pipe - Opens/closes as needed by building's plumbing system - ? Rated 500 DFU?s for venting DWV 4? and smaller ## Why choose this product - Engineered for Reliable Plumbing Ventilation - Ideal for Indian Homes & Plumbers ## How to use 1. Locate the appropriate vent pipe in your plumbing system where a secondary vent is needed, typically in a branch line serving multiple fixtures. — Identify Vent Pipe Location 2. Connect the Oatey Air Admittance Valve to the 3-inch or 4-inch vent pipe using appropriate fittings and solvent cement, ensuring a secure and airtight seal. — Install Valve 3. Run water through the fixtures connected to the vent to simulate pressure changes and confirm the valve opens to release air and closes properly. — Test Operation ## Product details | Field | Value | |---|---| | Application | Secondary vent for DWV systems | | DFU Rating | 500 DFU | | Vent Pipe Size | Up to 4 inches | | Operation | Opens/closes as needed by building's plumbing system | | Compliance | ASSE Standard 1050 and 1051 | | Brand | Oatey | | Model Name | 500 Stack DFU Capacity Air Admittance Valve with Straight PVC Schedule 40 Adapter | | Part Number | 39223 | | Model Number | 39223 | | Material | Polyvinyl Chloride (PVC) | | Color | Black/White | | Size | 3 in. – 4 in. 160 Branch | | Inlet Connection Size | 4 inches | | Inlet Connection Type | Socket Weld | | Outlet Connection Size | 3 inches | | Outlet Connection Type | FNPT | | Item Weight | 0.8 pounds (0.36 kg) | | Item Dimensions | 4.1 inches (L) x 8 inches (W) x 11.5 inches (H) | | Number of Ports | 160 | | Valve Type | One Way | | Exterior Finish | PVC | | Country of Origin | Not stated by manufacturer — US retail version, sourced from authorized US retailers | ## Frequently asked questions ### How is this Oatey Air Admittance Valve authentic vs the version sold in Indian stores? Sourced directly from authorized US retailers (Amazon.com, Walmart, Costco), factory-sealed, imported per-order. Same SKU and formulation US buyers receive. All customs duties and GST included in the displayed price. Arrives {{ccc_delivery_eta}} via ExpressBox tracked shipping. ### Will the Oatey Air Admittance Valve I receive match what is shown on the US retailer's page? Yes, orders are placed against the listed US retailer page at the time of purchase. Batch codes, packaging, and labels match what the US retailer dispatches. Photographs of every order are taken before international handover. ### What is the DFU rating for this Oatey Air Admittance Valve? This Oatey Air Admittance Valve is rated for 500 DFU (Drainage Fixture Units), suitable for venting DWV systems up to 4 inches and smaller. ### What standards does the Oatey Air Admittance Valve comply with? The Oatey Air Admittance Valve complies with ASSE Standard 1050 and 1051, ensuring it meets rigorous industry requirements for secondary venting. ### Can this valve be used as a primary vent? No, this Oatey Air Admittance Valve is designed for use as a secondary vent to supplement the primary venting system. ### What is the vent pipe size compatibility for this valve? This valve is approved to handle vent pipes up to 4 inches in diameter, making it versatile for various plumbing setups. ## Compliance This product is a plumbing fitting. Ensure installation complies with local building codes. Not intended for use as a primary vent. Always consult a qualified plumber for installation and system design. ## Images 1. https://images.crowcrowcrow.com/B001GTVK62-0.webp 2. https://images.crowcrowcrow.com/B001GTVK62-3.webp 3. https://images.crowcrowcrow.com/B001GTVK62-6.webp 4. https://images.crowcrowcrow.com/B001GTVK62-9.webp 5. https://images.crowcrowcrow.com/B001GTVK62-12.webp --- Source: https://crowcrowcrow.com/p/oatey-air-admittance-valve-3in-4in-500-dfu-39223-1-each/mvp6994 Returns: 30 days, free, by mail. Shipping: Free across India, 7–13 business days. Prices are all-inclusive (duties + GST).