Chrome plated standard 3/4 " nipple push-in breather for valve covers with 1.22 - 1.25"" diameter holes.
Use grommet #GC VB120.
2.75" outside diameter.
Baffle inside nipple and filter element prevents oil seepage.
Also fits many GM valve covers as a replacement for the tube that runs from the valve cover to the air cleaner.

#GC VB220
12.99 each