UNI Universal 2-Stage Clamp-On Straight Pod Air Filter Features Clamps directly to carburetor Straight 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 2-1/4 / 57mm ID, 6 long foam