Push-in Valve Cover Breather is All Black and features an internal baffle to prevent oil splash and provide superior ventilation. Designed for 1-1/4 inch breather holes, with a 1 inch outside diameter neck. Ideal for use in conjunction with the grommet kit part number 66-520, this breather includes a replaceable internal foam insert. Manufactured using high quality materials, this oil filler breather cap’s steel construction ensuring it performs as well as it looks.