Trailer Leveling valve for air suspension does the task of adjusting the pressure in the air bag as per the pressure of your semi-truck. It ensures that the gap between the road and the truck’s body remains maintained throughout, pulling a safe journey. At Mytee Products, we have height control valves that are direct replacement for Peterbilt, Freightliner Volvo VNL leveling valves & more, for each make and model. Feel free to reach out to find the perfect fit for your semi.