General description Used on most American trucks and trailers, this 3X Truck Standard Air Leveling Height Control Valve is designed to replace various part numbers including VS-227, 171.H184, and 53321-Q120. It is suitable for all Hendrickson suspension applications, all 1980s Neway trailer air suspensions, and most other trailer air suspensions. Technical specifications Type: Truck Leveling Valve Inlet Port: NPT1/4 Max Working Pressure: 1.2 Mpa Hole Center: 38 mm Thread: 1/4-20 UNC L length: 175 to 295 mm Measurement allowed error: +/- 1-3 cm Material: Aluminum Installation Recommended installation angle: Maximum movement angle of 45 degrees L/A length ratio should be less than 1.2 Usage Note: Using a shorter yaw may result in increased air consumption. Other information Package Contents: 3 x Air Height Leveling Valve Color may vary slightly due to light reflection and different displays.