This is the right stuff against severe cases of the »Oil-leak-Blues«. The blue gaskets replace the old cork gaskets on Knucklehead, Panhead, Shovel and Sportster pushrod covers. The standard cork seals on these machines dry out, harden, crack and leak in a relatively short time. Tec Blue seals are made from a silicone compound and withstand heat, oil and compression and - keep sealing!