Clamp directly to carburetor. Angled or 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. 15 deg. angle. I.D. Inches: 2in.. Length Inches: 6in.