Beaver Island AS568-252 Buna-N O-Ring, 70A 5 1/4" ID x 1/8" CS, 10-Pack

Key features

• FITS: Universal AS568-252 o-ring size | Nominal 5 1/4" ID x 1/8" CS | Actual 5.234" ID x 0.139" CS (tolerance ±0.035" ID / ±0.004" CS, 5.512" OD) | Replaces any standard dash-252 70A o-ring across pumps, valves, filters, gearboxes, hydraulics and plumbing.
• WHAT YOU GET: 10 o-rings, precision-molded to the AS568-252 standard and inspected for finish and dimensional accuracy. Durometer 70A. Lubricant is not included; see our Pro Tip below.
• BUILT TO LAST: Buna-N (nitrile) resists oil, fuel, water and abrasion, holding a tight seal in most pump, valve and hydraulic service. Molded from virgin compound for consistent squeeze and long service life.
• DIY-FRIENDLY: Drop-in replacement — no special tools required for most o-ring changes. Clean the groove, seat the ring, and lubricate before assembly. Backed by Beaver Island Parts Company, an American family-owned small business.
• PRO TIP - USE WITH AQUA FLEX LUBRICANT: Before install, coat the rubber with Aqua Flex lubricant, formulated for pool, spa and equipment seals, to ease seating and extend seal life. Search "Aqua Flex" on Amazon.

Chasing 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.This Beaver Island Parts Company replacement o-ring is a 10-pack of AS568-252 o-ring, a universal industry-standard size. Its nominal size is 5 1/4" inside diameter by 1/8" cross-section; the actual measured dimensions are 5.234" ID by 0.139" CS, held to a tolerance of ±0.035" on the ID and ±0.004" on the CS, for a 5.512" outer diameter. It is molded in 70A Buna-N Nitrile rubber and is a drop-in replacement for any standard dash-252 o-ring.Full Compatibility: AS568-252 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 5.234" ID x 0.139" CS o-ring, this is the size.Installation Note: 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.Pro Tip: Apply Aqua Flex lubricant, formulated for pool and equipment seals, to the o-ring before installation to ease seating

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