2.5″ diameter x 2 1/8″ ht. w/o logo. (no rubber grommet included). Dress up your engine with this sharp looking, chrome-plated push-on oil breather. Internally baffled and uses a high-porosity filter, great for hi-performance use! Fits factory and aftermarket valve covers with 1.22″ dia. hole. Replaces OEM GM breather 6421868 on late 65-67 GM big b