High temperature silicone O-Ring for use with 3/8" compression fittings. This is the same o-ring included with our 3/8" compression fittings and also for the racking cane on the F1/F2 Sanke Keg Fermenter Kits. Replace the compression ferrules for a removable seal. Most compression fittings require two to seal, this part is for a single o-ring.