The Meritor R3011870 is a Height Control Valve Assembly with Dump, engineered for Hendrickson AR2 truck suspension applications. This valve features a Barksdale-style valve with four ports and one integrated dump port, eliminating the need for a separate dump valve. The dump style uses applied air to dump. The arm length is 7 inches and is unique to Hendrickson truck suspensions. Port fittings are 1/4 in. NPT. A bracket is included; linkage is not. This is a genuine Hendrickson product sold by Pro Gear and Transmission. It replaces Hendrickson OE part number 57977-000. Call us to confirm proper fit for your application.Interchanges:579770008235R3011870HD57977000HK57977000HUD57977000TDAR3011870Automann 171H218Automann 171H218OEAutomann 171H913Automann 171H913OEDayton Parts Batco 3341648Hendrickson 57977-000FeaturesHeight Control Valve Assembly with integrated dump port – eliminates need for a separate dump valveBarksdale valve style with four ports and one dumpApply-air-to-dump configuration7 in. arm length, unique to Hendrickson truck suspensions1/4 in. NPT fittings and port sizeBracket included; replaces Hendrickson OE part 57977-000Tech SpecsValve Style: BarksdaleDump Style: Apply Air to DumpArm Length: 7 in.Fittings and Port Size: 1/4 in. NPTPorts: Four ports and one dumpApplication: Hendrickson AR2 suspensionBracket Included: YesLinkage Included: NoReplaces OE Part: Hendrickson 57977-000Marketing Group: Valves, RegulatorsAdditional InformationFeatured in Hendrickson Suspension Catalog PB9968-HND.