Mr Gasket - 1971 - Mr. Gasket Rear Main Seal - Viton® - High Vacuum

This Mr. Gasket Rear Main Seal is made from Viton® Rubber. This style of rubber can handle high temperature like silicone rubber, but with superior abrasion resistance. It's durability and design make it recommended for applications that have high engine vacuum, like racing engines that utilize external vacuum pumps for crankcase evacuation.