A fuel cap with lock is a security accessory for vehicles that protects the fuel tank from theft or tampering. This locking cap replaces the standard fuel cap and features a built-in lock that can only be opened with a specific key. This mechanism ensures that only authorized personnel can access the contents of the tank. The product is typically made of durable material that is resistant to weather conditions and wear. It is a convenient option for both private and commercial vehicles, offering not only extra security but also peace of mind for the owner or fleet manager.