{"product_id":"o-ring-drain-vent-valve","title":"Pentair O-Ring for Rainbow Dynamic Series Drain and Vent Valve","description":"\u003cp\u003eThe Pentair R172221Z is the genuine o-ring for the Rainbow Dynamic Series drain and vent valve. It is listed on the Pentair Rainbow chlorinator parts breakdown for models HC-3315, HC-3330 and 3340, and on the Pentair Dynamic Filter Series II RTLRCF breakdown.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat it does\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe drain and vent valve is what lets you relieve pressure and drain the feeder before opening it. Its o-ring is the only thing holding water back at that point, and once the ring has hardened, flattened or picked up a nick from chemical residue, the valve weeps whenever the system runs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWorth doing properly\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThis is a low cost part that gets skipped and then costs a second trip. Fit the factory ring while the valve is already apart, and lubricate it with a seal safe lubricant rather than petroleum grease.\u003c\/p\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":48628835942612,"sku":"RAI-051-3476","price":4.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/default_f9833f76-a921-479c-95e0-f17674417016.jpg?v=1788753827","url":"https:\/\/www.activepoolsupply.com\/products\/o-ring-drain-vent-valve","provider":"Active Pool Supply","version":"1.0","type":"link"}