The Derbi GP1 50cc Fuel Tank Cap is a genuine spare part manufactured by Derbi. This fuel tank cap, with the manufacturer part number 00G00402131, is designed to fit the Derbi GP1 50cc motorcycle. It is a high-quality replacement part that ensures a proper seal to keep out dirt and debris, maintaining the fuel tank's integrity and functionality. Whether you need to replace a damaged cap or simply want to upgrade to a genuine Derbi part, this fuel tank cap is a reliable choice for your motorcycle.