Mega O-ring kits are available from MFP Seals (Martin Fluid Power), for the most common J.I.S. B 2401 series sizes.

The kit contains 1,225 O-rings, with cross section sizes of 1.5, 1.9, 2.0, 2.4, 3.1, and 3.5 mm O-rings. Featuring a rugged cary case, and secure sub-cases, the J.I.S. O-Ring kit is ready for any repair project you might have in the field, or in the shop.

Made from MFP’s N6003-90 duro NBR compound, they are designed for use with repair kit inventory. They are rated for temperatures from –20° to 100° C (–4° to 212°F).