JEGS Valve Cover Grommets are designed to work in specific applications to insure a positive seal and prevent leaks. Made from durable neoprene they are also designed to withstand the varying temperatures and chemicals an engine may see. Fits valve covers with a 1-1/4" hole. Steel valve cover grommets have a 1/8" wide groove and aluminum valve cover grommets have a 1/4" wide groove to insure proper fit and seal. The valve cover plugs can be used as a plug or the bottom can be cut off for use with a breather. Our baffled grommets are cylindrical and foam filled for use with roller rockers or where a traditional large metal baffle is not practical. Sold 2/pkg.