{"product_id":"check-valve-pvc-inj-1-4-npt","title":"Rola-Chem Injection Check Valve, PVC, 1\/4\" NPT","description":"\u003cp\u003eThe Rola-Chem 521170 is a PVC injection check valve for peristaltic chemical metering pumps. It sits at the injection point where the feed line meets the plumbing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat it does\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA metering pump pushes small doses of chemical into a pressurised return line. When the pump stops, that pressure wants to go back the other way. The check valve is what stops it, keeping pool water and chemical out of the feed tube and out of the pump head. It is a small fitting doing a job that protects a much more expensive one.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCheck the connection before ordering\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe supplied data describes this valve two different ways. The product title gives 1\/4 inch NPT; the detailed description gives 3\/8 inch barb by 1\/4 inch barb. We have listed both rather than choosing one for you. If the fitting size is critical, measure what is on the system now or get in touch and we will confirm.\u003c\/p\u003e","brand":"Rola-Chem","offers":[{"title":"Default Title","offer_id":48626288001236,"sku":"ROL-451-1170","price":41.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/521170.jpg?v=1788707710","url":"https:\/\/www.activepoolsupply.com\/products\/check-valve-pvc-inj-1-4-npt","provider":"Active Pool Supply","version":"1.0","type":"link"}