K&N 1.25in Flange ID x 3in OD x 2.5 inch 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 1380 crankcase vent filter has a black rubber top and base. The filter is 2 1 2 inches tall, 3 inches in outside diameter with a 1 1 4 inch inside diameter flange which is designed to clamp onto a vent tube or outlet. Constructed with a cotton filter media it can be cleaned and reused