The Midland Haldex 90555057 level valve is a PR Plus height control valve for liftable suspension, with a dump valve that is normally open. The fixed arm is listed as 5.5″ and 7.0″. It has a 1/4″ PTC supply port, a 1/4″ PTC pilot port and a 1/4″ PTC delivery port, and it uses an end manifold. A height control valve of this kind is an air suspension valve that controls ride height, and it has adjustment features so that height can be set accurately. A genuine Midland Haldex part from Pro Gear and Transmission. Call us to confirm proper fit for your application.A factory handling fee of $25.00 per unit is added at checkout.FeaturesPR Plus height control valve with dump, for liftable suspensionFixed arm listed as 5.5″ and 7.0″Supply port, pilot port and delivery port, each 1/4″ PTCDump valve type: normally openEnd manifold styleAdjustable to set ride heightTech SpecsArm: 5.5″ and 7.0″ FixedDelivery Ports: (1) 1/4″ PTCSupply Port: (1) 1/4″ PTCPilot Port: 1/4″ PTCDump Valve Type: Normally OpenManifold Style: End Manifold