30mm Carburetor for GY6 250cc & CF250cc Water-cooled ATV, Go Kart, Moped & Scooter. The item fits for GY6 250cc Engine & CF250cc Water-Cooled Engine. The material:total aluminium The inside diameter of carburetor:30mm The outside diameter connected with air filter:50mm BRAND NEW PRODUCTS.BEST QUALITY GUARANTEED.