{"title":"Scupper Drains","description":"","products":[{"product_id":"qbp942188","title":"Attwood Marine Stainless Steel Scupper Valve, Barbed, 1-1\/2 in Hose","description":"\u003ch6\u003eOverview\u003c\/h6\u003e\u003cp\u003eThe Attwood Marine 66553-3 is a stainless steel scupper valve with a barbed outlet for 1-1\/2 inch I.D. hose. It is used on self-bailing cockpit drains and installs in a 2 inch hole, with a standard thread length that fits hull or transom thickness up to 3 inches. The overall length is 5-1\/2 inches.\u003c\/p\u003e\u003cp\u003eThe body is cast in enhanced 316 stainless steel with a polished finish and passivation for added corrosion resistance. A neoprene flap with a molded V opens to drain cockpit water and closes to help limit backwash, which is useful on boats that take spray at rest or while backing down.\u003c\/p\u003e\u003ch6\u003eKey features\u003c\/h6\u003e\u003cul\u003e\n\u003cli\u003eFits 1-1\/2 inch I.D. cockpit drain hose\u003c\/li\u003e\n\u003cli\u003eUses a 2 inch installation hole and fits hull or transom thickness up to 3 inches\u003c\/li\u003e\n\u003cli\u003eEnhanced 316 stainless steel body with a polished, passivated finish\u003c\/li\u003e\n\u003cli\u003eNeoprene scupper flap with molded V helps reduce water washing back into the cockpit\u003c\/li\u003e\n\u003cli\u003eBarbed tail leaves room for secure hose clamping at the drain connection\u003c\/li\u003e\n\u003cli\u003eWrench fitting and sealant groove under the flange help make installation more controlled from inside the hull\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch6\u003eInstallation and fit\u003c\/h6\u003e\u003cp\u003eThis fitting is for above-waterline use. On a self-bailing cockpit it mounts in the transom or hull, with the outlet set at least 12 inches above the maximum water line. The hose run should fall from the cockpit drain to the scupper so water can move out of the deck drain without pooling in the line.\u003c\/p\u003e\u003cp\u003eFor replacement work, check three points before ordering: 1-1\/2 inch I.D. hose, a 2 inch cutout or hole saw size, and enough depth for the 3-1\/2 inch thread section and 5-1\/2 inch overall length. The barbed tail and inside-hull tightening nut make it a practical fit where access is available from inside the transom.\u003c\/p\u003e\u003ch6\u003eUse on board\u003c\/h6\u003e\u003cp\u003eThis scupper valve suits center consoles, bay boats, walkarounds, and other boats with self-bailing decks that use a 1-1\/2 inch drain hose at the cockpit outlet. It also makes sense for refit work where the existing drain layout already matches the hose size, cutout, and above-waterline mounting position.\u003c\/p\u003e","brand":"Attwood Marine","offers":[{"title":"Default Title","offer_id":52023489527989,"sku":"QBP942188","price":102.83,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0977\/8171\/1029\/files\/1329538_qbp942188.jpg?v=1780191825"},{"product_id":"qbp852062","title":"Attwood Marine Drain Plug and Receiver Kit, 3\/4 in, Threaded Receiver, Black Plastic","description":"\u003ch6\u003eOverview\u003c\/h6\u003e\u003cp\u003eThe Attwood Marine 17211-3 is a 3\/4 in drain plug and receiver kit for small recreational boats, inflatables, and personal watercraft. The plug threads into its receiver and seals with an elastomeric gasket, and the receiver sleeve measures about 15\/16 in for installations built around this compact drain size.\u003c\/p\u003e\u003cp\u003eIt replaces the full drain closure assembly rather than only the plug, which matters when the old receiver is worn, cracked, or no longer holding a clean seal. The molded black plastic body will not rust, and the retaining strap keeps the plug attached to the receiver so it is less likely to go missing at launch, haul-out, or storage.\u003c\/p\u003e\u003ch6\u003eKey features\u003c\/h6\u003e\u003cul\u003e\n\u003cli\u003e3\/4 in threaded plug size for small-boat and PWC drain openings that use this style\u003c\/li\u003e\n\u003cli\u003eMolded black plastic plug and receiver with a retaining strap that keeps the plug attached\u003c\/li\u003e\n\u003cli\u003eElastomeric gasket helps seal the receiver against the mounting surface\u003c\/li\u003e\n\u003cli\u003eIncludes mounting screws so the receiver can be replaced at the same time as the plug\u003c\/li\u003e\n\u003cli\u003eA practical fix when the existing receiver threads are worn or the plug no longer seats cleanly\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch6\u003eInstallation and fit\u003c\/h6\u003e\u003cp\u003eFit matters more with drain hardware than with most small boat accessories. Check that your hull or transom drain uses a 3\/4 in threaded plug and that the receiver footprint matches the existing mounting area before drilling or bedding the new part.\u003c\/p\u003e\u003cp\u003eBecause this kit includes the receiver, gasket, and screws, it makes sense when the old assembly is damaged or when a loose receiver is letting water track around the flange instead of through the drain opening. Install it on a clean surface so the gasket can seat evenly.\u003c\/p\u003e\u003ch6\u003eUse on board\u003c\/h6\u003e\u003cp\u003eThis kit suits PWCs, tenders, inflatables, and small runabouts that are launched often and drained after use or after washdown. The attached plug is especially handy on boats that live on a trailer, where drain plugs are easy to misplace between trips.\u003c\/p\u003e\u003cp\u003eFor buyers trying to match an existing setup, the main checkpoint is the drain style rather than the brand of boat. If your boat already uses a compact 3\/4 in threaded drain plug assembly, this kit is a straightforward replacement path.\u003c\/p\u003e\u003ch6\u003eWhat's included\u003c\/h6\u003e\u003cul\u003e\n\u003cli\u003e3\/4 in threaded drain plug with molded retaining strap\u003c\/li\u003e\n\u003cli\u003eThreaded receiver\u003c\/li\u003e\n\u003cli\u003eElastomeric gasket\u003c\/li\u003e\n\u003cli\u003eMounting screws\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Attwood Marine","offers":[{"title":"Default Title","offer_id":52023489593525,"sku":"QBP852062","price":8.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0977\/8171\/1029\/files\/1329544_qbp852062.jpg?v=1780191826"},{"product_id":"qbp224358","title":"T-H Marine Flow-Max™ Ball Scupper - Clear FMS-1-0-DP","description":"\u003cp\u003e\u003cstrong\u003eFlow-Max™ Ball Scupper - Clear\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eReplace your old worn-out flapper scupper with our new Flow-Max™ positive sealing ball scupper. A larger exit hole allows 70% more water drainage than its nearest competitor. Multiple mounting holes make retrofits quick and easy - no filling holes or re-drilling. A neutral buoyancy ball ensures the ball won't float up and break the seal. Meets all ABYC standards.\u003c\/p\u003e \u003cp\u003eThe easy twist-off design makes cleaning debris a snap. Simply twist counterclockwise to remove the ball cavity, clean out and twist back on. Stainless steel security pin provided for added safety.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eReplaces worn out flapper scuppers\u003c\/li\u003e \u003cli\u003e70% more drainage than competitive models\u003c\/li\u003e \u003cli\u003eTwist off for easy cleaning\u003c\/li\u003e \u003cli\u003eRetrofits all hole patterns\u003c\/li\u003e \u003cli\u003eThe seal is slotted to fit over 1-1\/4\" motor well tubes\u003c\/li\u003e \u003cli\u003e3” Diameter x 2-1\/2” H\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThe Flow Max Scupper only comes with one screw. The screws that screw it to the boat do not come with it. They will be different for every boat depending on the hull thickness but you will need a flat head screw. Screw included is a #4 x 1\/4\" Phillips Pan Head Stainless Steel Screw.\u003c\/p\u003e","brand":"T-H Marine","offers":[{"title":"Default Title","offer_id":52024072863925,"sku":"QBP224358","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0977\/8171\/1029\/files\/1244614_qbp224358.jpg?v=1763264395"},{"product_id":"qbp136940","title":"T-H Marine Double Barb Inline Scupper Check Valve - 1-1\/8\" - Black ILS-1200-DP","description":"\u003cp\u003e\u003cstrong\u003eDouble Barb Inline Scupper Check Valve - 1-1\/8\" - Black\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA great solution to provide a scupper check valve in the drain line. Allows use of standard thru-hull fittings in the cockpit and on the hull exterior.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePrevents Backwash\u003c\/li\u003e\n\u003cli\u003eChemical Resistant Materials\u003c\/li\u003e\n\u003cli\u003eThermo-Plastic Flapper\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"T-H Marine","offers":[{"title":"Default Title","offer_id":52024081809589,"sku":"QBP136940","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0977\/8171\/1029\/files\/1245236_qbp136940.jpg?v=1763264591"},{"product_id":"qbp294632","title":"T-H Marine Double Barb Inline Scupper Check Valve - 1-1\/2\" - Black ILS-1500-DP","description":"\u003cp\u003e\u003cstrong\u003eDouble Barb Inline Scupper Check Valve - 1-1\/2\" - Black\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA great solution to provide a scupper check valve in the drain line. Allows use of standard thru-hull fittings in the cockpit and on the hull exterior.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePrevents Backwash\u003c\/li\u003e\n\u003cli\u003eChemical Resistant Materials\u003c\/li\u003e\n\u003cli\u003eThermo-Plastic Flapper\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"T-H Marine","offers":[{"title":"Default Title","offer_id":52024081842357,"sku":"QBP294632","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0977\/8171\/1029\/files\/1245237_qbp294632.jpg?v=1763264592"},{"product_id":"qbp280476","title":"T-H Marine Double Barb Inline Scupper Check Valve - 3\/4\" - Black ILS-750-DP","description":"\u003cp\u003e\u003cstrong\u003eDouble Barb Inline Scupper Check Valve - 3\/4\" - Black\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA great solution to provide a scupper check valve in the drain line. Allows use of standard thru-hull fittings in the cockpit and on the hull exterior.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePrevents Backwash\u003c\/li\u003e\n\u003cli\u003eChemical Resistant Materials\u003c\/li\u003e\n\u003cli\u003eThermo-Plastic Flapper\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"T-H Marine","offers":[{"title":"Default Title","offer_id":52024081875125,"sku":"QBP280476","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0977\/8171\/1029\/files\/1245238_qbp280476.jpg?v=1763264593"},{"product_id":"qbp384806","title":"GROCO Deck Scupper 90 Degree 1-1\/2\" Hose Connection SCUS-1590","description":"\u003cp\u003e\u003cstrong\u003eDeck Scupper 90 Degree 1-1\/2\" Hose Connection\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e90 Degree Barb\u003c\/li\u003e \u003cli\u003eScuppers are installed flush with the deck and have a removable drain.\u003c\/li\u003e \u003cli\u003e#316 Stainless Steel Thru Deck Drain with Bronze Hose Connection\u003c\/li\u003e \u003cli\u003e1-1\/4\" and 1-1\/2\" ID hose connections are offered in straight, 45 degree and 90 degree orientation.\u003c\/li\u003e \u003c\/ul\u003e","brand":"GROCO","offers":[{"title":"Default Title","offer_id":52024135975093,"sku":"QBP384806","price":186.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0977\/8171\/1029\/files\/1248562_qbp384806.jpg?v=1763265680"},{"product_id":"qbp701315","title":"Attwood Marine Thru-Hull Scupper Service Kit, Outer Ring, Rubber Flapper, 4 Stainless Steel Screws","description":"\u003ch6\u003eOverview\u003c\/h6\u003e\u003cp\u003eThe Attwood Marine 3881KIT-1 is a service kit for the 3881-1 thru-transom scupper assembly. It replaces the wear parts at the outside face of the drain, including the outer ring, rubber flapper, and mounting screws, so an existing scupper can be refreshed without changing the original hose connection or transom cutout.\u003c\/p\u003e\u003cp\u003eThis kit fits the Attwood 3881-1 scupper used with 1-1\/2 inch I.D. hose and a 2 inch installation hole. It is a practical fix when the flap has gone stiff, split, or stopped closing flat against the outlet, which can let water wash back into the cockpit or splashwell.\u003c\/p\u003e\u003cp\u003eOn boats where the main thru-hull body is still in good shape, this kit handles the parts that see the most weather and movement at the transom. It makes the most sense for routine maintenance on an above-waterline drain rather than a full replacement of the complete scupper assembly.\u003c\/p\u003e\u003ch6\u003eKey features\u003c\/h6\u003e\u003cul\u003e\n\u003cli\u003eService kit for the Attwood 3881-1 thru-transom scupper assembly\u003c\/li\u003e\n\u003cli\u003eFits the scupper assembly used with 1-1\/2 inch I.D. hose\u003c\/li\u003e\n\u003cli\u003eMatches the 2 inch installation hole used by the 3881-1 assembly\u003c\/li\u003e\n\u003cli\u003eIncludes replacement outer ring, rubber flapper, and four stainless steel screws\u003c\/li\u003e\n\u003cli\u003eRestores flap action at the transom outlet to help limit backwash into the boat\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch6\u003eCompatibility and fit\u003c\/h6\u003e\u003cp\u003eThis kit is meant for owners who already have the Attwood 3881-1 scupper in place and need to renew the external service parts. It does not replace the full thru-hull body or hose connection, so it is best used when the installed fitting is still secure and the main issue is at the flap or outer face.\u003c\/p\u003e\u003cp\u003eBecause the matching scupper assembly is an above-waterline transom drain, this kit suits cockpit and splashwell drainage points where water needs to exit freely and the flap needs to close back against the outlet after flow stops.\u003c\/p\u003e\u003ch6\u003eInstallation and upkeep\u003c\/h6\u003e\u003cp\u003eInstallation is straightforward for a like-for-like service job on an existing 3881-1 setup. Before fitting the new parts, it is worth checking that the mounted scupper body is not cracked and that the hose connection inside the hull is still sound. If those parts are damaged, the full assembly will need attention rather than only the service kit.\u003c\/p\u003e\u003cp\u003eThis is a good match for seasonal maintenance on boats that stay outside, run in rough water, or see frequent washdowns at the stern, where the flap and outer trim ring tend to wear first.\u003c\/p\u003e\u003ch6\u003eWhat’s included\u003c\/h6\u003e\u003cul\u003e\n\u003cli\u003eOuter ring\u003c\/li\u003e\n\u003cli\u003eRubber flapper\u003c\/li\u003e\n\u003cli\u003eFour stainless steel screws\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Attwood Marine","offers":[{"title":"Default Title","offer_id":52581868830901,"sku":"QBP701315","price":8.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0977\/8171\/1029\/files\/1329235_qbp701315.jpg?v=1780200959"},{"product_id":"qbp714513","title":"Attwood Marine Stainless Steel Scupper Valve, SS316, Neoprene Flap, Mirror Finish","description":"\u003ch6\u003eOverview\u003c\/h6\u003e\u003cp\u003eThe Attwood Marine Stainless Steel Scupper Valves is a range of barbed stainless steel scupper valves for cockpit, deck, and transom drain installations above the water line. These fittings combine a polished stainless exterior with an internal scupper flap that helps limit backwash when water pushes back toward the drain outlet.\u003c\/p\u003e\u003cp\u003eThis range covers 1-1\/2 in and 2 in hose sizes, giving boat builders and owners a straightforward way to match the valve to existing drain hose and hull thickness. The bodies use Enhanced 316 stainless steel alloy, and the barbed tail gives room for hose clamps at the connection point.\u003c\/p\u003e\u003ch6\u003eKey features\u003c\/h6\u003e\u003cul\u003e\n\u003cli\u003eEnhanced 316 stainless steel alloy body for drain outlets exposed to spray, washdowns, and saltwater air.\u003c\/li\u003e\n\u003cli\u003eScupper flap uses tough neoprene rubber with a molded V that seats into the grooved body to help reduce backwash.\u003c\/li\u003e\n\u003cli\u003eConcealed, corrosion-proof fasteners keep the outside face clean and reduce exposed hardware around the drain outlet.\u003c\/li\u003e\n\u003cli\u003eBarbed tail end leaves room for multiple hose clamps, which is useful where drain hose movement and vibration need a secure connection.\u003c\/li\u003e\n\u003cli\u003eChannel under the flange helps hold a bead of sealant during installation for a cleaner seal at the hull or transom surface.\u003c\/li\u003e\n\u003cli\u003eWrench flats or an end notch give the installer a gripping surface so the fitting can be tightened from inside the hull.\u003c\/li\u003e\n\u003cli\u003eIntended for installation above the water line only.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch6\u003eVariants\u003c\/h6\u003e\u003cp\u003eThis product is offered in two hose-size configurations for matching different scupper drain runs.\u003c\/p\u003e\u003cp\u003eThe hose size, thread size, installation hole saw size, and maximum hull thickness change between the two variants. The scupper flap construction, stainless steel valve body, and above-waterline installation requirement remain consistent across these barbed scupper valve models.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e66553-1: 1-1\/2 in hose size. This version uses 1-1\/2 in NPSM threads, a 2 in installation hole saw size, and supports up to 3 in maximum hull thickness.\u003c\/li\u003e\n\u003cli\u003e66555-1: 2 in hose size. This version uses 2 in NPSM threads, a 2-1\/2 in installation hole saw size, and supports up to 2 in maximum hull thickness.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch6\u003eInstallation and fit\u003c\/h6\u003e\u003cp\u003eMatch the valve to the inside diameter of the drain hose already on the boat, then confirm the hole saw size and available hull thickness before cutting or replacing an existing fitting. The 1-1\/2 in version has a 3 in flange outside diameter and 5-1\/2 in total length, while the 2 in version has a 3-5\/8 in flange outside diameter and 4-1\/2 in total length.\u003c\/p\u003e\u003cp\u003eBecause this is a scupper valve, placement matters. It belongs in an above-waterline drain outlet where the flap can help with backwash while still allowing deck or cockpit water to leave the boat. The barbed outlet should be paired with hose of the correct size and clamps suitable for the hose and installation environment.\u003c\/p\u003e\u003ch6\u003eUse on board\u003c\/h6\u003e\u003cp\u003eThese valves are a good match for owners, yards, and builders working on cockpit drains, deck drains, and transom scupper outlets where a stainless exterior is preferred over plastic. They make sense on fishing boats, center consoles, cruisers, and other vessels where drain outlets see spray, sun, and regular washdowns.\u003c\/p\u003e\u003ch6\u003eMaintenance and care\u003c\/h6\u003e\u003cp\u003eRinse the exterior with fresh water after saltwater use and inspect the flap during routine cleaning. A flap that is blocked by debris, marine growth, or hardened residue may not seat cleanly, so keeping the scupper area clear helps the valve drain properly and limit backwash as intended.\u003c\/p\u003e","brand":"Attwood Marine","offers":[{"title":"1-1\/2\"","offer_id":52581902713013,"sku":"QBP714513-V1","price":132.41,"currency_code":"USD","in_stock":false},{"title":"2\"","offer_id":52581902745781,"sku":"QBP714513-V2","price":132.44,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0977\/8171\/1029\/files\/1332928_qbp714513.jpg?v=1780201437"}],"url":"https:\/\/www.qualityboatparts.com\/collections\/scupper-drains.oembed","provider":"Quality Boat Parts","version":"1.0","type":"link"}