{"product_id":"m-343-p-or-bi-std-b90","title":"AS568-343 Buna-N Nitrile (90A) O-Ring, 90A Durometer, 3 3\/4\" ID x 3\/16\" CS (3.725\" x 0.210\" Actual, 4.145\" OD) - Precision-Molded Replacement Sealing Ring for Pumps, Valves, Filters, Gearboxes \u0026 Hydraulics","description":"\u003cp\u003eChasing a leak or a slow drip and need the exact o-ring size to seal it for good? A worn or wrong-size o-ring lets fluid weep past the joint, drops pressure, and can damage the equipment around it.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eThis Beaver Island Parts Company replacement o-ring is a single AS568-343 o-ring, a universal industry-standard size. Its nominal size is 3 3\/4\" inside diameter by 3\/16\" cross-section; the actual measured dimensions are 3.725\" ID by 0.210\" CS, held to a tolerance of ±0.028\" on the ID and ±0.005\" on the CS, for a 4.145\" outer diameter. It is molded in 90A Buna-N Nitrile rubber and is a drop-in replacement for any standard dash-343 o-ring.\u003c\/p\u003e\u003cbr\u003e\u003cb\u003eFull Compatibility:\u003c\/b\u003e AS568-343 is a standard o-ring dash size used across pumps, filters, valves, gearboxes, hydraulic fittings, plumbing and countless machines. If your application calls for a 3.725\" ID x 0.210\" CS o-ring, this is the size.\u003cbr\u003e\u003cb\u003eInstallation Note:\u003c\/b\u003e Clean the groove, inspect the sealing surface, seat the new o-ring without twisting it, and lubricate before assembly. No special tools are required for most o-ring changes.\u003cbr\u003e\u003cb\u003ePro Tip:\u003c\/b\u003e Apply \u003ca href=\"https:\/\/beaverislandparts.com\/products\/aqua-flex-food-grade-silicone-lubricant-50g\" target=\"_blank\" rel=\"noopener\"\u003eAqua Flex\u003c\/a\u003e lubricant to the o-ring before installation to ease seating and extend seal life.\u003cbr\u003e\u003cp\u003eWe are an American family-owned and operated small business committed to providing high-quality replacement parts and straightforward, honest fitment information so you can fix it once and get back to work.\u003c\/p\u003e","brand":"Beaver Island Parts Company","offers":[{"title":"1 (Single)","offer_id":48610231943373,"sku":"M.343.1.OR.BI.STD.B90","price":9.99,"currency_code":"USD","in_stock":true},{"title":"5-Pack","offer_id":48610231976141,"sku":"M.343.5.OR.BI.STD.B90","price":17.99,"currency_code":"USD","in_stock":true},{"title":"10-Pack","offer_id":48610232008909,"sku":"M.343.10.OR.BI.STD.B90","price":25.99,"currency_code":"USD","in_stock":true},{"title":"25-Pack","offer_id":48610232041677,"sku":"M.343.25.OR.BI.STD.B90","price":54.99,"currency_code":"USD","in_stock":true},{"title":"50-Pack","offer_id":48610232074445,"sku":"M.343.50.OR.BI.STD.B90","price":91.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/8110\/0237\/files\/AS568-343_4074202e-c139-4a0b-ad37-28a69ec2e513.png?v=1785885597","url":"https:\/\/beaverislandparts.com\/products\/m-343-p-or-bi-std-b90","provider":"Beaver Island Parts Company","version":"1.0","type":"link"}