K&N 1.25in Flange ID x 3in OD x 2.5in H Rubber Base Crankcase Vent FilterK&N crankcase vent filters are perfect for racing applications, vintage cars or individuals who want to add some aesthetics to their classic carbureted engine. The 62 1390 crankcase vent filter has a K&N embossed chrome plated steel top with a black rubber base. The filter is 2 1 2 inches tall, 3 inches in outside diameter with a 1 1 4 inch flange which is designed to push on to the existing rubber breather grommets. This air filter is constructed