{"product_id":"pentair-178746z-union-diamond-seal","title":"Pentair Genuine OEM Union Diamond Seal, 178746Z","description":"\u003cp\u003eThe Pentair 178746Z is the union diamond seal, the sealing ring that sits in the groove of a Pentair filter union. It is the genuine Pentair part and it appears on the Clean and Clear RP cartridge filter parts breakdown.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy the profile matters\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe seal has a diamond section rather than a round one, which is what lets it seat in the union groove and hold under the load of the union nut. A standard o-ring of similar size will sit in the groove but will not seal the same way, which is why unions patched with the wrong ring keep weeping.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen to fit one\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eReplace it any time the union is opened for filter service, and any time a joint drips after the nut has been tightened. Kill the pump, relieve pressure at the air bleed and open the union before working on the seal.\u003c\/p\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":48629534720212,"sku":"PAC-051-1787","price":10.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/default_52d9dd76-3065-4896-8de5-209074d35d8e.jpg?v=1788766205","url":"https:\/\/www.activepoolsupply.com\/products\/pentair-178746z-union-diamond-seal","provider":"Active Pool Supply","version":"1.0","type":"link"}