Perfectly Solve 4WD Problems: The solenoid and vacuum check valve kit solves front end rattling and pulls 4WD into place, allowing your vehicle to run smoothly and quietly. Timely replacing solenoids and check valves can help prevent wheel grinding and more costly repairsEasy to Replace: The design and function are comparable to the original, ensuring perfect fit and compatibility, no need to spend more money on hiring professionals, you can easily install this kit in 10 minutes, saving time and laborReliable and Durable: Through precision engineering design, solenoid valves are made of metal and high quality plastics, and vacuum check valves are made of high quality plastics and rubbers, which are long lasting and high temperature resistant, and can withstand all kinds of road conditions and driving styles, maintaining stable performance and ensuring a longer service lifeOne Stop Solution: Providing a solenoid valve and vacuum check valve kit allows you to purchase and replace two key components at one time at a more cost effective price, solving the problem quickly while ensuring that the two key components are perfectly matched to avoid air leaks caused by poor connections and maintain vacuum pressure balanceCompatibility: Specifically designed for select Ford models. Fits for 2015-2020 Ford F150, fits for 2018+ Ford Expedition, fits for 2018+ Lincoln Navigator. Check valve replace part number: 926-390, FL3Z3A788B, FL3Z-3A788-B-1, FL34-7A788-AD, FL3Z-3A788-A, FL3Z-3A788-B. Vacuum solenoid part number: 7L1Z-9H465-B 9L14-9H465-BA 6L3Z-9H465-B 7L1Z9H465B 9L149H465BA