General description Replace your trailer truck's height leveling control valve with the 2X 52321-Q120A model. This valve is compatible with various suspension systems, ensuring optimal performance for your vehicle. Technical specifications Replace Part Numbers: VS-227, 53321-Q120, 52321-Q120A Inlet Port: NPT 1/4 Inch Max Working Pressure: 1.2 MPa Hole Center: 38 mm Thread: 1/4-20 UNC Material: Metal Color: Black Measurement Allowed Error: +/- 1-3 cm Compatibility and accessories Fits all Hendrickson Suspension Applications Compatible with all Neway Trailer Air Suspensions from the 1980s to current models Works with most other Trailer Air Suspensions Installation Maximum movement angle: 45° Length ratio L/A should be less than or equal to 1.2 Length L should be between 175 mm and 295 mm For Neway suspensions, measure from the bottom of the frame to the center of the axle, considering suspension heights of 8 1/2 inches, 10 1/2 inches, and 17 1/2 inches Usage Using a shorter yaw may