361 Silicone O-Ring, 70A Durometer, Red, 6" ID, 6-3/8" OD, 3/16" Width (Pack of 5): O Ring Seals: Amazon.com: Industrial & Scientific
100pcs) Metric M17X3 Metric O-Rings, Buna-N 70-Durometer Nitrile (Buna N - 70 Durometer) Ships Free in USA by Aspen Fasteners, ASMM1260: O Ring Seals: Amazon.com: Industrial & Scientific