American Plumber, Culligan, Pentek OR-100 O-Ring for Big Blue Housings
Confetti Silicone Big O Key Ring - Kathy's Kreations
Cow Silicone Big O® Key Ring | Dillard's
AIVOOF 4" Metal O-Ring, 2 Pack 304 Seamless Welding Stainless Steel Rings Heavy Duty Smooth Solid Multi-Purpose Big Ring for for Crafts, 10mm x 80mm: Amazon.com: Industrial & Scientific