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. Uni Filter's Angled Dual Layer “POD” Filters are the same as Dual Layer “POD” but are “angled” 15º to accommodate tight or unusual installations. Fit: OEM 22mm/24mm/28mm Mikuni as well as the Aftermarket 26mm Mikuni Dimensions: 1.75" Inner Diameter 3.5" Outer Diameter 4" Length