{"product_id":"1052579-ring-backup-fits-caterpillar-models","title":"1052579 Ring Backup Fits Caterpillar Models","description":"\u003ch3\u003eOne New Aftermarket Replacement Backup Ring for Caterpillar (Cat) Excavators\u003c\/h3\u003e\u003cp\u003eThis backup ring (also listed as BU-Ring or Ring-Backup) is a hydraulic cylinder seal component used in bucket, stick, and hydraulic cylinder assemblies on Caterpillar (Cat) excavators. Backup rings support primary seals under high-pressure hydraulic conditions, preventing seal extrusion and maintaining cylinder integrity during operation.\u003c\/p\u003e\u003ch4\u003eCompatible Models\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eCaterpillar Excavators:\u003c\/strong\u003e 318B, 318B N, 318C, 319D L, 319D LN, 320B, 320B FM LL, 320C, 320C FM, 320D, 320E, 320E RR, 322, 322B, 322C, 324D, 324D L, 324E, 324E L, 324E LN, 325B, 325C, 326D L, 328D LCR, 330C L, 345B II, 345C, 375\u003c\/p\u003e\u003ch4\u003eReplaces Part Number(s):\u003c\/h4\u003e\u003cp\u003e1052579\u003c\/p\u003e\u003cp\u003eNew aftermarket replacement part - not remanufactured, not used.\u003c\/p\u003e","brand":"Reliable Aftermarket Parts, Inc® -OD","offers":[{"title":"Default Title","offer_id":42453193392211,"sku":"1052579","price":38.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0079\/4060\/3955\/files\/1052579_01.jpg?v=1757719016","url":"https:\/\/www.reliableaftermarketparts.ca\/products\/1052579-ring-backup-fits-caterpillar-models","provider":"Reliable Aftermarket Parts, Inc®","version":"1.0","type":"link"}