O-ring. Harley-Davidson part number 11270. Note: All reference to H-D part numbers is for identification purposes only. We in no way are implying that any of S&S Cycle's products are original equipment parts or that they are equivalent to the corresponding H-D part number shown. S&S Part #: 50-8037
Tags: S&S Cycle, Harley Davidson, Classic Pre-1984, Engine, Pushrod