Air Filter Adapter for Mikuni Carbs. Allows use of a large filter, For 24 & 28mm Genuine Mikuni Flat Slide Carburetors.Also fits Large Body (Genuine VM22-133) 22mm Round Slide MikunisWill not fit Small Body (Chinese) Mikunis 44mm Opening 2 7/16" O.D. Use AFR175 Air Filter Filter not included