{"product_id":"air-release-valve","title":"Pentair Air Release Valve, 1\/4\" NPT Brass","description":"\u003cp\u003ePentair U212-252D is a brass air release valve with a 1\/4 inch NPT thread, listed for the Sta-Rite HRPB high rate sand filters, the HRP sand filters and the DEPB vertical DE filters.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat it is for\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAir gets into a filter tank every time the system is opened or loses prime. It gathers at the top, takes up space the water should occupy and drops the filter efficiency. The air release valve gives it somewhere to go: open the valve on start up, wait for a steady stream of water, and close it again.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eA safety habit worth keeping\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eUse this valve to relieve pressure before you open a filter clamp or lid. A tank still under pressure can throw a lid, and that is the injury nobody expects. Opening the release valve first takes seconds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBrass body\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe valve body is brass rather than plastic, which is what you want on a part that gets handled and turned regularly through the season.\u003c\/p\u003e","brand":"Sta-Rite","offers":[{"title":"Default Title","offer_id":48634625851604,"sku":"SWQ-051-4729","price":38.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/default_4602dc1d-26c0-4016-9e2d-c77a4c5938e5.jpg?v=1788835538","url":"https:\/\/www.activepoolsupply.com\/products\/air-release-valve","provider":"Active Pool Supply","version":"1.0","type":"link"}