{"product_id":"tank-o-ring-4","title":"Sta-Rite 35505-7438 System 3 Elbow O-Ring","description":"\u003cp\u003eThe Sta-Rite 35505-7438 is a replacement o-ring for the System 3 modular DE filter, covering models S7D75 and S8D110.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich o-ring is it\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe source data is not consistent about the position. The listing name calls it the System 3 elbow o-ring, while the product record for the same part number calls it a tank o-ring. The part number itself, 35505-7438, is the reliable detail, so check it against the parts diagram for your filter before ordering rather than going by the name alone.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen to replace it\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eO-rings harden, flatten and take a set with age and heat, and that is the usual reason a filter starts to weep at a joint. Any time that joint is opened, fitting a new o-ring is cheaper than going back a second time.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFitting\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eClean the groove and the mating face before the new ring goes in, and use a pool grade silicone lubricant. Petroleum based grease swells rubber and ruins an o-ring quickly.\u003c\/p\u003e","brand":"Sta-Rite","offers":[{"title":"Default Title","offer_id":48633772048596,"sku":"STA-051-7438","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/default_95c04301-85d8-4532-810a-5b7aad4ade08.jpg?v=1788815119","url":"https:\/\/www.activepoolsupply.com\/products\/tank-o-ring-4","provider":"Active Pool Supply","version":"1.0","type":"link"}