Perm-Align Valve Cover Gasket Set Buy now for $96.50 USPS shipping within U.S. Mainland. These  valve cover gaskets are manufactured from 30-durometer rubber, which is molded over and vulcanized to a rigid steel frame. They won’t leak, blow out, or get sucked in, the way stock or inferior-quality aftermarket gaskets can. These gaskets feature superior-quality rubber and steel, which outlast cork-and-rubber composite designs to provide years of dependable service, especially if you frequently have to remove and reinstall the valve covers.