{"product_id":"1-2-ttube-x-tube-check-valve-spring-style","title":"Pentair Rainbow 1\/2\" Tube x Tube Check Valve, Spring Style, R172324","description":"\u003cp\u003eThe Pentair Rainbow R172324 is a spring style check valve with 1\/2 inch tube by tube connections, listed with the Rainbow automatic chemical feeder parts for the model 300 and 29x series.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy the check valve matters\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA chemical feeder is plumbed into a line that carries pressure while the pump runs and goes still when it stops. The check valve is what keeps feeder solution moving in one direction only. Without a working check, concentrated solution can find its way back along the pipe when the system shuts down, which is hard on the equipment it reaches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpring style\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe spring holds the valve closed until flow opens it, so the valve seals no matter how the tubing is routed. That is the difference between this version and a check that relies on gravity and has to be mounted a particular way.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eService life\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eCheck valves in feeder plumbing are consumables. Springs weaken, seats scale up and seals harden, and the failure is quiet: everything looks normal until you notice the valve no longer holds. If yours passes water backward, replace it.\u003c\/p\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":48628841644244,"sku":"RAI-451-4045","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/default_32f091d5-53a1-40a1-80a6-a8fd81f89eb1.jpg?v=1788755145","url":"https:\/\/www.activepoolsupply.com\/products\/1-2-ttube-x-tube-check-valve-spring-style","provider":"Active Pool Supply","version":"1.0","type":"link"}