--- product_id: 1961199 title: "Attwood 3876-3 Boat Self-Bailing Cockpit Mounted Scupper Valve Kit" brand: "attwood" price: "¥4316" currency: JPY in_stock: true reviews_count: 13 category: "Attwood" url: https://www.desertcart.jp/products/1961199-attwood-3876-3-boat-self-bailing-cockpit-mounted-scupper-valve store_origin: JP region: Japan --- # Max flow drainage Easy 4-screw install Durable rubber flapper Attwood 3876-3 Boat Self-Bailing Cockpit Mounted Scupper Valve Kit **Brand:** attwood **Price:** ¥4316 **Availability:** ✅ In Stock ## Summary > 🚤 Keep your deck dry and your boat cruising—drain smarter, sail safer! ## Quick Answers - **What is this?** Attwood 3876-3 Boat Self-Bailing Cockpit Mounted Scupper Valve Kit by attwood - **How much does it cost?** ¥4316 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/1961199-attwood-3876-3-boat-self-bailing-cockpit-mounted-scupper-valve) ## Best For - attwood enthusiasts ## Why This Product - Trusted attwood brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Last:** Thick, corrosion-resistant flapper resists warping and clogging for long-term reliability. - • **Simple DIY Upgrade:** Mounts easily over existing 2-inch thru-hull fittings with just 4 screws—no hassle, no fuss. - • **Trusted Marine Quality:** ISO 9001, ABYC, USCG, and CE certified—engineered by Attwood, a century-strong marine innovator. - • **Effortless Water Drainage:** Rubber flapper opens fully for max flow, keeping your cockpit dry and safe. - • **Versatile Mounting Options:** Install on transom above waterline or as a thru-hull cockpit drain to fit your boat’s needs. ## Overview The Attwood 3876-3 Boat Self-Bailing Cockpit Mounted Scupper Valve Kit features a durable rubber flapper valve designed for efficient water drainage and backflow prevention. It fits over existing 2-inch thru-hull fittings and includes corrosion-resistant hardware for easy installation. Certified to marine standards, this kit offers a reliable, long-lasting solution to keep your cockpit dry and your boat performing at its best. ## Description Designed for boats with self bailing cockpits, this scupper valve features a rubber flapper that opens to drain water out and closes to prevent water from washing back in. Inlcudes corrosion-resistant retainer ring, screws, rubber flapper valve and gasket. Attwood Corporation has been an award-winning leader in engineering, testing, and manufacturing the highest quality marine products for over 100 years. We deliver safe and reliable lighting, fuel systems, water systems, seating & pedestals, swim ladders, custom upholstery, and general marine accessories that are easy to install and meet regulatory compliance. Review: works perfectly - i tried the fancy scuppers, and in the end they just don't last. i heard the ball ones can get clogged easy, are loud, and need to be at right level to work right. so i skipped trying that one. i did try the duckbill. it worked great at sealing and keeping water out. but due to the design, it didn't drain very fast. i didn't really like that. it would also clog at the littlest piece of anything. biggest problem was that it warped and deteriorated far too fast. since it's molded in a specific shape, once that shape is compromised it doesn't work very well. on this type, the flap is thick and doesn't warp very much(and is easily replaceable), it opens fully to drain at max flow, and it seals enough to keep water out. they may be low tech, but the standard flapper scupper is my preference. Review: Low cost improvement to keep decks dry - Flappers get deformed over time and let water flow back into boat. These high quality replacements are very easy to install (4 screws) and are exact OEM parts. I would recommend. First photo is replaced flapper and second photo is original deformed flapper. ## Features - Efficiently drains water from self bailing cockpits - Designed to be mounted over existing thru-hull fittings up to 2 inch - Inlcudes retainer ring, screws, rubber flapper valve and gasket. - Can be mounted on transom above waterline or as thru-hull cockpit drain - Diameter: 2-7/8 inch ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B002FVQ0WY | | Best Sellers Rank | #54,495 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #55 in Boat Plumbing Fittings | | Brand | attwood | | Brand Name | attwood | | Connector Type | Threaded | | Customer Reviews | 4.5 out of 5 stars 341 Reviews | | Exterior Finish | Brass | | Global Trade Identification Number | 00022697387639 | | Included Components | End Product & Information | | Inlet Connection Size | 2 Inches | | Inlet Connection Type | Female Iron Pipe | | Item Dimensions | 4.5 x 9.25 x 3.5 inches | | Item Type Name | boating-plumbing-fittings | | Item dimensions L x W x H | 4.5 x 9.25 x 3.5 inches | | Manufacturer | Attwood | | Manufacturer Part Number | 3876-3 | | Manufacturer Warranty Description | Please contact us if you experience any issues within 30 days of receipt. | | Material | Acetal | | Material Type | Acetal | | Model Number | 3876-3 | | Number of Pieces | 4 | | Number of Ports | 2 | | Outlet Connection Size | 2 Inches | | Outlet Connection Type | NPT | | Set Name | Kit | | Size | One Size | | Smart Home Compatibility | Not Smart Home Compatible | | Specification Met | ISO 9001, ABYC, USCG, CE | | UPC | 022697387639 | | Unit Count | 1.0 Count | | Valve Type | check valve | ## Product Details - **Material:** Acetal - **Brand:** attwood - **Item dimensions L x W x H:** 4.5 x 9.25 x 3.5 inches - **Exterior Finish:** Brass - **Inlet Connection Size:** 2 Inches - **Inlet Connection Type:** Female Iron Pipe - **Number of Ports:** 2 - **Valve Type:** check valve - **Global Trade Identification Number:** 00022697387639 - **Manufacturer:** Attwood ## Images ![Attwood 3876-3 Boat Self-Bailing Cockpit Mounted Scupper Valve Kit - Image 1](https://m.media-amazon.com/images/I/61sjRoMdFtL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Are the screws stainless steel or zinc plated?** A: Yes the screws provided are stainless steel. **Q: does this product come with plastic ring, scupper, gasket and mounting screws?** A: The kit I bought had 3 different sized gaskets, but none fit the original ring so I returned it for a full refund - I assume it was intended for a different manufacturer. **Q: My 96 sea-do speedster scupper outlet is on the transom at or just below the water line. does attwood make a product for under water use?** A: No **Q: Does this come with one or two valves?** A: Comes with one valve. ## Customer Reviews ### ⭐⭐⭐⭐⭐ works perfectly *by T***M on February 27, 2013* i tried the fancy scuppers, and in the end they just don't last. i heard the ball ones can get clogged easy, are loud, and need to be at right level to work right. so i skipped trying that one. i did try the duckbill. it worked great at sealing and keeping water out. but due to the design, it didn't drain very fast. i didn't really like that. it would also clog at the littlest piece of anything. biggest problem was that it warped and deteriorated far too fast. since it's molded in a specific shape, once that shape is compromised it doesn't work very well. on this type, the flap is thick and doesn't warp very much(and is easily replaceable), it opens fully to drain at max flow, and it seals enough to keep water out. they may be low tech, but the standard flapper scupper is my preference. ### ⭐⭐⭐⭐⭐ Low cost improvement to keep decks dry *by R***K on January 26, 2024* Flappers get deformed over time and let water flow back into boat. These high quality replacements are very easy to install (4 screws) and are exact OEM parts. I would recommend. First photo is replaced flapper and second photo is original deformed flapper. ### ⭐⭐⭐⭐⭐ Good *by L***G on March 10, 2026* Good ## Frequently Bought Together - Attwood 3876-3 Boat Self-Bailing Cockpit Mounted Scupper Valve Kit - 3M Marine Adhesive Sealant Fast Cure 5200 (05220) Permanent Bonding and Sealing for Boats and RVs Above and Below the Waterline Waterproof Repair, White, 3 fl oz Tube - SeaSense Cockpit Scupper Valve Od (2-7/8- Inch) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/1961199-attwood-3876-3-boat-self-bailing-cockpit-mounted-scupper-valve](https://www.desertcart.jp/products/1961199-attwood-3876-3-boat-self-bailing-cockpit-mounted-scupper-valve) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-07-17*