The New OS Max Carb Carburetor 3A is a high-quality replacement carburetor designed to fit O.S. engines such as the OS 35 FP, 40 FP, 40LA, and 46LA. Made in Japan, this carburetor is compatible with 2-stroke engines and is suitable for various vehicles including airplanes, helicopters, cars, trucks, motorcycles, and boats. It is designed for use with nitro and glow fuel, making it an essential component for RC model vehicle enthusiasts looking to optimize their engine performance.