Clamps directly to carburetor Angled design Black inner foam, red outer foam and a urethane flange For use on motorcycles, ATVs, go-carts, snowmobiles, air compressors, tractors and anything with a carburetor Use outside pre-filter dry for dusty conditions, oiled for extremely wet conditions Completely washable 2-3/4" / 70mm ID, 4" long foam