{"product_id":"50mm-upvc-transparent-flap-check-valve-non-return-drain-kitchen-sewer","title":"50mm UPVC Transparent Flap Check Valve – Non-Return Drain Set","description":"\n\u003ch2\u003e50mm UPVC Transparent Flap Check Valve – Non-Return Drain Valve Set\u003c\/h2\u003e\n\u003cp\u003eKeep your kitchen and bathroom drains flowing in the right direction with this \u003cstrong\u003e50mm UPVC Transparent Flap Check Valve\u003c\/strong\u003e. Designed as a complete combination set, this non-return valve prevents backflow of water and unpleasant sewer gases from rising up through your drainpipes — keeping your home smelling fresh and your plumbing working efficiently.\u003c\/p\u003e\n\n\u003cp\u003eThe transparent UPVC body lets you visually inspect water flow without removing the valve, making maintenance fast and hassle-free. The stainless steel flap mechanism ensures durable, corrosion-resistant performance even in wet, high-use environments.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e50mm (2-inch) diameter\u003c\/strong\u003e – fits standard UPVC drainpipes in kitchens, bathrooms, and utility rooms\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTransparent UPVC body\u003c\/strong\u003e – easy visual flow inspection without disassembly\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStainless steel flap\u003c\/strong\u003e – corrosion-resistant, long-lasting non-return mechanism\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNon-return \/ backflow prevention\u003c\/strong\u003e – stops wastewater and sewer gases from reversing into your drain\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOdour-blocking design\u003c\/strong\u003e – seals against sewer odours for a cleaner-smelling kitchen or bathroom\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eComplete combination set\u003c\/strong\u003e – everything you need for a straightforward installation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy DIY installation\u003c\/strong\u003e – no specialist tools required; compatible with standard UPVC pipe systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 50mm (2 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBody Material:\u003c\/strong\u003e UPVC (transparent)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlap Material:\u003c\/strong\u003e Stainless Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Flap Check Valve \/ Non-Return Valve\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Kitchen drain, bathroom sewer, utility drainpipe\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Made in China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e50mm UPVC Transparent Flap Check Valve\u003c\/li\u003e\n  \u003cli\u003eCombination set accessories (as pictured)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIdeal For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eKitchen sink drainpipes\u003c\/li\u003e\n  \u003cli\u003eBathroom floor drains and waste outlets\u003c\/li\u003e\n  \u003cli\u003eLaundry and utility room drainage\u003c\/li\u003e\n  \u003cli\u003eDIY plumbing upgrades and renovations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on safe plumbing practices and drainage standards, visit the U.S. Consumer Product Safety Commission (CPSC).\u003c\/p\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-5l-handheld-steam-cleaner-touch-screen-1800w-ce-certified\"\u003e1.5L Handheld Steam Cleaner Touch Screen 1800W | CE Certified\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-2l-smart-electric-dehumidifier-remote-control-anion-air-purifier\"\u003e1.2L Smart Electric Dehumidifier with Remote \u0026amp; Anion Purifier\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Valve\" target=\"_blank\" rel=\"noopener\"\u003eValve\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What pipe size does this UPVC check valve fit?\u003c\/h4\u003e\n\u003cp\u003eA: This flap check valve is designed to fit standard 50mm (2-inch) diameter UPVC drainpipes, making it compatible with most residential kitchen sinks, bathroom waste outlets, and utility drains.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How does the non-return flap valve prevent sewer odours?\u003c\/h4\u003e\n\u003cp\u003eA: The stainless steel flap sits closed when water is not flowing, creating a physical seal that blocks sewer gases and unpleasant odours from rising back up through the drainpipe into your home. When water flows through, the flap opens automatically, then closes again once flow stops.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is the transparent body purely visual, or does it serve a functional purpose?\u003c\/h4\u003e\n\u003cp\u003eA: The transparent UPVC body serves both aesthetic and practical purposes. It allows you to visually monitor water flow and check for any blockages or debris build-up inside the valve without having to remove or disassemble it, saving time during routine maintenance.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I install this check valve myself without a plumber?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. This combination set is designed for straightforward DIY installation on standard UPVC drainage systems. No specialist tools are required. Simply ensure the pipe diameter matches (50mm) and follow the included fitting instructions for a secure, leak-free connection.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What pipe size does this UPVC check valve fit?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This flap check valve is designed to fit standard 50mm (2-inch) diameter UPVC drainpipes, making it compatible with most residential kitchen sinks, bathroom waste outlets, and utility drains.\"}}, {\"@type\": \"Question\", \"name\": \"How does the non-return flap valve prevent sewer odours?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The stainless steel flap sits closed when water is not flowing, creating a physical seal that blocks sewer gases and unpleasant odours from rising back up through the drainpipe into your home. When water flows through, the flap opens automatically, then closes again once flow stops.\"}}, {\"@type\": \"Question\", \"name\": \"Is the transparent body purely visual, or does it serve a functional purpose?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The transparent UPVC body serves both aesthetic and practical purposes. It allows you to visually monitor water flow and check for any blockages or debris build-up inside the valve without having to remove or disassemble it, saving time during routine maintenance.\"}}, {\"@type\": \"Question\", \"name\": \"Can I install this check valve myself without a plumber?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. This combination set is designed for straightforward DIY installation on standard UPVC drainage systems. No specialist tools are required. Simply ensure the pipe diameter matches (50mm) and follow the included fitting instructions for a secure, leak-free connection.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/oasis-select.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Home \u0026 Living\", \"item\": \"https:\/\/oasis-select.com\/collections\/home-living\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"50mm UPVC Transparent Flap Check Valve – Non-Return Drain Set\", \"item\": \"https:\/\/oasis-select.com\/products\/50mm-upvc-transparent-flap-check-valve-non-return-drain-kitchen-sewer\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"50mm","offer_id":47746689597545,"sku":"14:115#50mm","price":25.29,"currency_code":"USD","in_stock":true},{"title":"110mm","offer_id":47746689630313,"sku":"14:371#110mm","price":25.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/Se3b87ff0e63c4272a519e53335c387cdW.webp?v=1783057616","url":"https:\/\/oasis-select.com\/products\/50mm-upvc-transparent-flap-check-valve-non-return-drain-kitchen-sewer","provider":"Oasis Select","version":"1.0","type":"link"}