{"product_id":"premium-upvc-swing-check-valve-25-75mm-horizontal-vertical-flapper-non-return-valve-aquarium-anti-siphon","title":"Premium UPVC Swing Check Valve (25-75mm) | Horizontal \u0026 Vertical Flapper Non-Return Valve | Aquarium Anti-Siphon","description":"\u003cdiv style=\"background-color: #f8f9fa; padding: 10px; border-left: 4px solid #0056b3; margin-bottom: 20px;\"\u003e\u003cp style=\"margin: 0;\"\u003e\u003cem\u003e🚀 Need massive valves for Koi ponds or industrial mainlines? \u003cstrong\u003e\u003ca href=\"%E6%9B%BF%E6%8D%A2%E4%B8%BA%E6%96%B9%E6%A1%88B%E5%A4%A7%E5%B0%BA%E5%AF%B8%E9%93%BE%E6%8E%A5\" style=\"color: #0056b3; text-decoration: underline;\"\u003eClick here for our Heavy-Duty Check Valves (90mm - 200mm)\u003c\/a\u003e\u003c\/strong\u003e.\u003c\/em\u003e\u003c\/p\u003e\u003c\/div\u003e\u003ch2\u003ePremium UPVC Bolted Swing Check Valve\u003c\/h2\u003e\u003cp\u003eProtect your water pumps and prevent catastrophic back-siphoning floods with the Bolted UPVC Swing Check Valve from \u003cstrong\u003eAtradesen.com\u003c\/strong\u003e. Engineered for professional sumps, marine reef tanks, and critical water supply lines, this highly reliable non-return valve features a robust bolted housing, ensuring water only flows in one direction while withstanding significant system pressure.\u003c\/p\u003e\u003ch3\u003e🌟 Advanced Flap Design \u0026amp; Durability\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Bolted Housing:\u003c\/strong\u003e Unlike cheap glued or threaded valves, the two halves of this valve are securely clamped together with stainless steel bolts, allowing for extreme pressure resistance and future disassembly for maintenance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Flow Resistance:\u003c\/strong\u003e The swinging flap design creates significantly less water friction and head pressure loss than spring-loaded valves, resulting in a smoother operation that won't choke your pump's output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100% Rust-Proof Core:\u003c\/strong\u003e Constructed purely from chemical-grade UPVC with zero internal metal parts. Safe for saltwater reef aquariums.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003e🚨 CRUCIAL INSTALLATION \u0026amp; WATER PRESSURE GUIDE!\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTo ensure a 100% leak-proof seal, you MUST match your installation angle to your pump's water pressure. Read the Atradesen.com rules below:\u003c\/p\u003e\u003cul style=\"background-color: #f8d7da; padding: 15px 15px 15px 35px; border-radius: 5px; color: #721c24; border: 1px solid #f5c6cb;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e⚠️ DIRECTIONAL ARROW:\u003c\/strong\u003e You MUST install the valve so the molded arrow points in the direction of your pump's water flow!\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e🚨 HIGH WATER PRESSURE (Vertical Mount OK):\u003c\/strong\u003e If your water pump is very powerful, you can install this valve vertically. The strong water flow will push the flap open, and the strong gravity backpressure will snap it shut.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e🚨 LOW WATER PRESSURE (Horizontal Mount REQUIRED):\u003c\/strong\u003e If you are using a low-wattage pump or have weak water flow, \u003cb\u003eyou MUST install this valve horizontally (flat)!\u003c\/b\u003e In a vertical setup, a weak pump may struggle to push the heavy flap open, and weak backpressure will fail to seal it. Horizontal mounting allows gravity to help seal the flap perfectly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSizing Logic:\u003c\/strong\u003e The sizes listed (e.g., 32mm) refer to the \u003cb\u003eInner Diameter (I.D.)\u003c\/b\u003e of the sockets, which sleeve \u003cb\u003eOVER\u003c\/b\u003e matching PVC pipes.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Atradesen","offers":[{"title":"25mm I.D. (DN20 | Horizontal \u0026 Vertical Flap)","offer_id":56664319852710,"sku":null,"price":6.54,"currency_code":"USD","in_stock":true},{"title":"32mm I.D. (DN25 | Horizontal \u0026 Vertical Flap)","offer_id":56664319885478,"sku":null,"price":8.21,"currency_code":"USD","in_stock":true},{"title":"40mm I.D. (DN32 | Horizontal \u0026 Vertical Flap)","offer_id":56664319918246,"sku":null,"price":10.23,"currency_code":"USD","in_stock":true},{"title":"50mm I.D. (DN40 | Horizontal \u0026 Vertical Flap)","offer_id":56664319951014,"sku":null,"price":11.67,"currency_code":"USD","in_stock":true},{"title":"63mm I.D. (DN50 | Horizontal \u0026 Vertical Flap)","offer_id":56664319983782,"sku":null,"price":13.54,"currency_code":"USD","in_stock":true},{"title":"75mm I.D. (DN65 | Horizontal \u0026 Vertical Flap)","offer_id":56664320016550,"sku":null,"price":16.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/2588\/6118\/files\/Premium_UPVC_Swing_Check_Valve_25-200mm_Horizontal_Vertical_Flapper_Non-Return_Valve_Aquarium_Anti-Siphon-002.png?v=1781587226","url":"https:\/\/atradesen.com\/products\/premium-upvc-swing-check-valve-25-75mm-horizontal-vertical-flapper-non-return-valve-aquarium-anti-siphon","provider":"Atradesen","version":"1.0","type":"link"}