When you try to order a sealing O-ring for the piston in a 500x5 wheel brake Aircraft Spruce is supplying an AN6227B-23 instead of the required MS28775-218. The major difference is cross section dimension. The AN part is 1/8" (0.125") and the MS part is 0.139". The smaller part will leak. I have relayed the information to them.
Bob Axsom
Bob Axsom
