JEGS Billet Valve Cover Breather Baffle allows you to install a breather on valve covers that do not have a breather hole or add an additional breather. Prevents oil from entering the breather thus extending the life and performance. Our dual o-ring design insures that the breather is properly sealed. Works with most standard 1.22" push-in style breathers and requires a 1-3/8" diameter hole. Sold 1/pkg. Breather sold separately.