Gas cap for 2021-2024 Ford F-150 trucks, Ranger and Maverick that have an Easy Fuel capless fuel system. Protect your vehicle's fuel system from unwanted dirt or water. This cap is designed as a preventative measure to keep unwanted debris out of your fuel system, it will not help to fix a check engine light due to an EVAP leak. It has a friction fit over the outside of your fuel filler making it very secure but easy to use. The inside diameter of the cap is approximately 2 1/8 " (55mm). If your fuel filler is larger or smaller than that then this cap will NOT fit. Please measure your fuel filler before purchasing. This is a 3D printed part made out of Thermoplastic polyurethane. It is a tough flexible material that will last a very long time.