Earls 178006ERL Stat-O-Seal 3/8″ O-Ring, (Pack of 2)

The stat-o-seal is very simply the best sealing washer available. It consists of a synthetic rubber O ring mechanically locked to the I.D. of an aluminum washer. When tightened, the O ring is compressed, forcing the sealing surfaces around the bolt shank. They will form a positive seal over a temperature range of negative 85 degrees to positive 450 degrees Fahrenheit. They provide the advantages of an O ring type seal without the necessity of machining O ring grooves into the part. In any application where you are now using a copper or aluminum sealing washer, the stat-o-seal will do a better job.

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Best Sealing Washer Available
Synthetic Rubber O-Ring
Mechanically Locked; Bagged Packaging; 3/8 inch ID; 3 AN Fitting; Package Of 2
O-Ring Compresses
Forces Sealing Surfaces