BS 4518 0395-30 Buna-N Nitrile Metric O-Ring, 70A Durometer, 39.5mm ID x 3mm CS (1.555" x 0.118") - Precision-Molded Replacement Sealing Ring

FINAL SALE - NO RETURNS. THIS IS A STANDARD CATALOGUE SIZE; CONFIRM YOUR INSIDE DIAMETER, CROSS-SECTION AND MATERIAL BEFORE ORDERING.

Every dimension, material and durometer for this o-ring is published above. Because these are standard catalogue sizes chosen by measurement rather than by pump model, they ship as final sale. If we send the wrong item, or it arrives damaged or defective, we replace it free of charge - that never changes.

Chasing a leak or a slow drip and need the exact metric 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 single BS 4518 0395-30 o-ring, a standard metric sealing size measuring 39.5mm inside diameter by 3mm cross-section (1.555" ID x 0.118" CS, 45.5mm outer diameter), molded in 70A Buna-N Nitrile rubber.

Full Compatibility: BS 4518 0395-30 is an international-standard o-ring size used across pumps, valves, filters, fittings and machinery worldwide. If your application calls for a 39.5mm x 3mm 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.
Pro Tip: Apply Aqua Flex lubricant before installation to ease seating and extend seal life.

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