Proflow's valve cover baffle kits are perfect for installing a breather system on your valve covers. They're designed for use on valve covers that do not have breather holes—or when an extra one is needed in a different location. The kits features a 1 in. double O-ring I.D. for use with most push-in breathers. They are baffled to prevent unwanted oil from pushing out of the breather. The baffles require an appropriately sized hole drilled into the cover; and include a lock nut, sealing washer, O-ring, and threaded baffle.