110 Silicone O-Ring, 70A Durometer, Red, 3/8" ID, 9/16" OD, 3/32" Width (Pack of 100): O Ring Seals: Amazon.com: Industrial & Scientific
Express Water Whole House O-Ring Replacement Kit 5.5 in. O.D. Dia O-Rings for Filter Housings 3-O-Rings with Lubricant Tube PRTORINGWH3 - The Home Depot