This delay-type height control valve fits Mack R Model trucks with air suspension systems. It manages airbag pressure with a built-in delay to keep ride height steady as loads shift, adding or releasing air between the frame and axle to maintain consistent suspension geometry. Sold individually.Interchanges:Mack 20QE312620QE3126P220QE318620QE324420QE3244P225122111H00450CAFeaturesHeight control valve, delay typeFor air suspension systemsFits all Mack R Model trucksSell pack: 1 eachTech SpecsType: Height Control Valve, Delay TypeApplication: All Mack R Model trucksSell Pack: 1 EachUsed in this Truck Cab modelMack Cab Suspension Parts & Diagrams