Feature: 1. Stainless Steel: The filler cap is made of 316 stainless steel, rustproof, with high polish, brightness, and flatness to withstand harsh marine environments, offering maximum resistance and durability in saline water conditions. 2. With Key: Includes a dedicated key for the boat fuel fill cap, providing enhanced security and reliable access to your fuel system. 3. Leak-Proof Seal: Features a rubber sealing ring that ensures a tight seal between the cap and tank, preventing leaks and improving fuel system reliability. 4. Versatile Compatibility: Compatible with various vehicles including boats, yachts, caravans, RVs, trucks, tractors, and trailers, making it a practical solution for multiple fuel tank applications. 5. Easy Installation: Designed with a caliber of 48mm and an outer diameter of 50mm for straightforward installation. This user-friendly design allows for a quick and hassle-free setup. Specification: Item Type: Boat Fuel Tank Cap Material: 316 Stainless Steel, Polished Finish Caliber: Approx. 48mm / 1.9in Outer Diameter: Approx. 50mm / 2in Application: Suitable for boats, yachts, caravans, RVs, trucks, tractors, and trailer fuel tanks Package List: 1 x Boat Fuel Tank Cap 1 x Key