Mr. Gasket Timing Chain Cover Seals are designed to provide a reliable seal for crankshaft and are designed for use around a rotating shaft to prevent fluid or vapor leaks. A gasket-like material is used between two or more parts to prevent fluid or vapor leaks. The timing cover seal goes around the hole that the crank pulley bolts on to. The seal sits on the timing cover around the hole at the bottom. This timing cover seal is made of nitrile rubber.