For use with HiPoTek PCV valves. 

Fits cast valve covers such as Edelbrock and Mopar Magnum. Grommet has a 1.22 OD, and 3/4 ID, and are 1/4" thick.
Note:   Cannot be used in the Mopar valve cover holes intended for the filler cap.

Not intended for use with the OEM PCV valve.