{"product_id":"o-ring-backplate-1","title":"Polaris PB4-60 Backplate O-Ring, New Style","description":"\u003cp\u003ePolaris R0536600 is the new style backplate o-ring for the PB4-60 booster pump. Polaris lists it for pumps built after serial number PB120111001, and also catalogs it as the booster pump housing o-ring, new style.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSerial number first\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003ePolaris changed this ring partway through production. The number on the serial plate decides which one your pump takes, so check it before ordering rather than going by the look of the old ring, which will have deformed in service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat a worn ring looks like\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eRings flatten, harden and split with heat and time. The symptom is a drip at the joint, or an air leak that makes the pump noisy and unreliable. Neither improves with tightening.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThe right time to change it\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt costs very little and it is already exposed whenever the wet end is open, so replace it as a matter of course during a shaft seal or impeller job rather than putting an aged ring back in.\u003c\/p\u003e","brand":"Zodiac","offers":[{"title":"Default Title","offer_id":48626212536532,"sku":"POL-101-5366","price":24.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/default_136226ce-39e6-46db-8be7-6850bdf67be9.jpg?v=1788706221","url":"https:\/\/www.activepoolsupply.com\/products\/o-ring-backplate-1","provider":"Active Pool Supply","version":"1.0","type":"link"}