--- product_id: 54649129 title: "PVC Plastic Check Sewage Drain Non-Return Double Flap Valve Backwater Prevented 160mm" brand: "plumbing4home" price: "Β£223.02" currency: GBP in_stock: true category: "Plumbing4 Home" url: https://www.desertcart.co.uk/products/54649129-pvc-plastic-check-sewage-drain-non-return-double-flap-valve store_origin: GB region: United Kingdom --- # Rodent-proof guards 160mm pipe fit Double flap security PVC Plastic Check Sewage Drain Non-Return Double Flap Valve Backwater Prevented 160mm **Brand:** plumbing4home **Price:** Β£223.02 **Availability:** βœ… In Stock ## Summary > πŸ› οΈ Secure your space, stop the flow, and keep the pests out! ## Quick Answers - **What is this?** PVC Plastic Check Sewage Drain Non-Return Double Flap Valve Backwater Prevented 160mm by plumbing4home - **How much does it cost?** Β£223.02 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/54649129-pvc-plastic-check-sewage-drain-non-return-double-flap-valve) ## Best For - plumbing4home enthusiasts ## Why This Product - Trusted plumbing4home brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Dual-Flap Defense:** Double flap design ensures maximum backflow prevention and flood protection. - β€’ **Self-Cleaning Flow:** Smooth internal surfaces prevent sediment buildup, maintaining optimal sewage flow. - β€’ **Precision 160mm Fit:** Seamlessly integrates with standard sewage pipes for hassle-free installation. - β€’ **Durable & Eco-Friendly:** Made from high-grade polypropylene and fiberglass-reinforced parts for long-lasting performance. - β€’ **Rodent-Resistant Shield:** Chromium-nickel guards block rodents from invading your space through drains. ## Overview The KARMAT 160mm PVC Double Flap Backwater Valve is engineered to protect lower floors from sewage and stormwater backflow, featuring rodent-proof chromium-nickel guards and a self-cleaning, sediment-resistant design. Made from durable polypropylene and fiberglass-reinforced components, it ensures reliable, maintenance-free operation while complying with building safety codes. ## Description KARMAT Backwater Valves (non-return valves) effectively secure any rooms located on the lower floors against flooding caused by back flow of storm water and sewage. Back flow may be caused by intense rains, thaw or floods. Use of anti-flooding devices for rooms located on the lower floors is required by obligatory regulations related to technical conditions that are to be satisfied by building codes. Karmat backwater valves are devices in which the flaps are equipped with chromium - nickel protecting guards securing the flap and gasket against rats and its sliding down during sewage flow. It is a very important feature in places particularly exposed to rodents’ attempts to pass through. Innovative construction of multi-flap valves enables undisturbed sewage flow while preserving complete and unnarrowed clearance of pipes in which they are installed. Unlike other devices of this type available in the market the Karmat double flap backwater valves there are no inserts installed inside which may disturb or obstruct sewage flow. Double flap backwater valves have smooth internal surfaces suitably profiled which causes its self-cleaning and prevents collection of sediments. Module construction of multi-flap valves enables in special cases, as required by clients, to extend devices with additional, independent flaps which greatly increase buildings safety. Backwater valves are installed in horizontal sewage pipes before they exit a building or sewage drain outside the building before its connection to an external network. They are also installed in inspection chambers made of concrete or plastic. Backwater valves are made of high-quality polypropylene (PP), a very durable and environment-friendly material. Polypropylene is resistant to the effects of aggressive chemicals and hot sewage (up to 95Β°C). Movable construction elements of valves are made of a material strengthened with fiberglass. ## Features - Installed in 160mm sewage pipes before they exit a building or sewage drains; - Prevents against rodents entering building interiors through the sewage and other sanitary systems; - Secure the lower floors against flooding caused by back flow of storm water and sewage; - Double-flap backwater valves offer a greater choice of security devices ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00QVHHTXW | | Best Sellers Rank | 863,975 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,888 in Pipes 2,378 in Drainage | | Brand | PLUMBING4HOME | | Connector Type | Flanged | | Exterior Finish | Plastic | | Exterior finish | Plastic | | Inlet Connection Size | 160 Millimeters | | Inlet Connection Type | Flange | | Inlet connection size | 160 Millimeters | | Inlet connection type | Flange | | Item Weight | 4 Kilograms | | Manufacturer | Karmat | | Material | Plastic, Polyvinyl Chloride (PVC) | | Number of Ports | 2 | | Outlet Connection Size | 160 Millimeters | | Outlet Connection Type | Flange | | Outlet connection type | Flange | | Part Number | 451b | | Set Name | 160 mm check valve (2-port) | | Specification Met | CE, WRAS | | Unit Count | 1.0 count | | Valve Type | Lift Check Valve | ## Product Details - **Brand:** PLUMBING4HOME - **Exterior finish:** Plastic - **Inlet connection size:** 160 Millimeters - **Inlet connection type:** Flange - **Material:** Plastic, Polyvinyl Chloride (PVC) - **Number of Packs:** 1 - **Number of ports:** 2 - **Outlet connection size:** 160 Millimeters - **Outlet connection type:** Flange - **Specification met:** CE, WRAS ## Images ![PVC Plastic Check Sewage Drain Non-Return Double Flap Valve Backwater Prevented 160mm - Image 1](https://m.media-amazon.com/images/I/41+KwnFWWbL.jpg) ![PVC Plastic Check Sewage Drain Non-Return Double Flap Valve Backwater Prevented 160mm - Image 2](https://m.media-amazon.com/images/I/71A8W1upj+L.jpg) ![PVC Plastic Check Sewage Drain Non-Return Double Flap Valve Backwater Prevented 160mm - Image 3](https://m.media-amazon.com/images/I/81PQLsQ8s5L.jpg) ![PVC Plastic Check Sewage Drain Non-Return Double Flap Valve Backwater Prevented 160mm - Image 4](https://m.media-amazon.com/images/I/61XlnR5QLLL.jpg) ## Frequently Bought Together - PVC Plastic Check Sewage Drain Non-Return Double Flap Valve Backwater Prevented 160mm - Retro Fit 110mm 4 inch Drain Non Return Valve with Stainless Steel Flap - Buffalo Pest Control Water and Rodent Non Return Valve 110mm / 4 inch --- ## 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.co.uk/products/54649129-pvc-plastic-check-sewage-drain-non-return-double-flap-valve](https://www.desertcart.co.uk/products/54649129-pvc-plastic-check-sewage-drain-non-return-double-flap-valve) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-01*