This locking fuel cap is black and fits universally. It's specifically designed for the Travel Trekker 50 Gallon Auxiliary In - Bed Fuel Tank (5410050). Part number: 9901750. It offers a reliable locking feature to keep your fuel secure.

To use this fuel cap, simply screw it onto the fuel tank opening until it's tight. Make sure it's properly aligned to avoid any fuel leakage. When you're not using the fuel tank, keep the cap locked to prevent unauthorized access. As for maintenance, clean the cap regularly with a mild soap and water solution to remove any dirt or debris. Check the locking mechanism periodically to ensure it's working smoothly. If you notice any damage or wear, replace the cap right away to keep your fuel tank safe.