{"product_id":"premium-clear-upvc-true-union-swing-check-valve-20-63mm-aquarium-anti-siphon-flap-valve-horizontal-vertical-mount","title":"Premium Clear UPVC True Union Swing Check Valve (20-63mm) | Aquarium Anti-Siphon Flap Valve | Horizontal \u0026 Vertical Mount","description":"\u003cdiv style=\"background-color: #f8f9fa; padding: 10px; border-left: 4px solid #0056b3; margin-bottom: 20px;\"\u003e\u003cp style=\"margin: 0;\"\u003e\u003cem\u003e🔄 Looking for matching pipes for a completely transparent plumbing manifold? Check out our \u003cstrong\u003e\u003ca href=\"https:\/\/atradesen.com\/collections\/colored-clear-pvc\/products\/premium-clear-upvc-rigid-pipe-16-75mm-non-toxic-aquarium-hydroponics-plumbing-transparent-diy-water-tube\" style=\"color: #0056b3; text-decoration: underline;\"\u003ePremium Clear UPVC Rigid Pipes\u003c\/a\u003e\u003c\/strong\u003e.\u003c\/em\u003e\u003c\/p\u003e\u003c\/div\u003e\u003ch2\u003ePremium Clear UPVC True Union Swing Check Valve\u003c\/h2\u003e\u003cp\u003ePrevent catastrophic back-siphoning and floods during power outages with our state-of-the-art Clear UPVC Swing Check Valve from \u003cstrong\u003eAtradesen.com\u003c\/strong\u003e. Engineered for professional sumps, marine reef tanks, and critical water supply lines, this \"True Union\" flap valve offers ultimate reliability, high visibility, and unrestricted flow dynamics.\u003c\/p\u003e\u003ch3\u003e🌟 Advanced Flap Design \u0026amp; Ultimate Convenience\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorizontal OR Vertical Mounting:\u003c\/strong\u003e Unlike \"Lift\" style check valves that only work straight up and down, this advanced \"Swing\/Flap\" mechanism works flawlessly whether installed vertically or completely flat (horizontally)!\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrystal Clear Visibility:\u003c\/strong\u003e The transparent body allows you to instantly inspect the internal flap. If a snail, algae, or debris ever prevents the flap from closing, you'll see it immediately before a flood happens!\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrue Union Quick-Release:\u003c\/strong\u003e Features threaded union nuts on both ends. You can completely remove the center valve body for cleaning or replacement without ever cutting your glued PVC pipes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100% Metal-Free \u0026amp; Corrosion Proof:\u003c\/strong\u003e Built entirely from premium UPVC and silicone seals. With no metal springs, it is absolutely safe for saltwater reef tanks and harsh chemicals (Rated for 1.0 Mpa \/ Max 55°C).\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003e⚠️ Installation \u0026amp; Sizing Guide (Crucial!)\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eEnsure a flawless, leak-proof setup by reviewing the Atradesen.com guidelines below:\u003c\/p\u003e\u003cul style=\"background-color: #fff3cd; padding: 15px 15px 15px 35px; border-radius: 5px; color: #856404;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e🚨 DIRECTIONAL INSTALLATION:\u003c\/strong\u003e Check valves only let water flow in ONE direction. 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🚨 SIZING LOGIC (Inner Dia. matches Outer Dia.):\u003c\/strong\u003e The sizes listed (e.g., 32mm) refer to the \u003cb\u003eInner Diameter (I.D.)\u003c\/b\u003e of the two union sockets. They are designed to sleeve \u003cb\u003eOVER\u003c\/b\u003e your rigid PVC pipes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection Method:\u003c\/strong\u003e PVC waterproof adhesive\/glue MUST be used on the two outer slip joints to secure your pipes permanently to the union halves.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Atradesen","offers":[{"title":"20mm I.D.","offer_id":56644231921830,"sku":null,"price":42.98,"currency_code":"USD","in_stock":true},{"title":"25mm I.D.","offer_id":56644231954598,"sku":null,"price":56.87,"currency_code":"USD","in_stock":true},{"title":"32mm I.D.","offer_id":56644231987366,"sku":null,"price":75.68,"currency_code":"USD","in_stock":true},{"title":"40mm I.D.","offer_id":56644232020134,"sku":null,"price":98.54,"currency_code":"USD","in_stock":true},{"title":"50mm I.D.","offer_id":56644232052902,"sku":null,"price":148.57,"currency_code":"USD","in_stock":true},{"title":"63mm I.D.","offer_id":56644232085670,"sku":null,"price":198.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/2588\/6118\/files\/Premium_Clear_UPVC_True_Union_Swing_Check_Valve_20-63mm_Aquarium_Anti-Siphon_Flap_Valve_Horizontal_Vertical_Mount-007-pictechai-watermarked-pictechai-watermarked.png?v=1781277268","url":"https:\/\/atradesen.com\/products\/premium-clear-upvc-true-union-swing-check-valve-20-63mm-aquarium-anti-siphon-flap-valve-horizontal-vertical-mount","provider":"Atradesen","version":"1.0","type":"link"}