This height control valve kit services Hendrickson air suspension systems, supplying the parts needed to regulate ride height by metering air into and out of the air springs as the axle-to-frame distance shifts. It is also a fit for Mack and Volvo applications using the same valve design. The kit is packaged and sold as one each.Interchanges:Mack 20503343Hendrickson 6408964089-000750728FeaturesSuspension height control valve kitSold as 1 eachTech SpecsSell pack: 1 EACH