HEIGHT CONTROL VALVE 500CK AR-V-500C 500C 2K500C 2K-500C LEVEL LEVELING HEIGHT CONTROL VALVE Hadley Manufacturing H00500C Valve Hadley H00500C Height Control Valve With integral dump valve for tractor, trailer and Class A RV applications (single suspension ports) Kit includes: H00500C valve, (3) levers and (2) brackets Volvo Truck Part Number 3945482 Hadley 2K-500C Instant Response Valve one of the fastest valves on the market includes integral dump facility 3/8" screw in fittings can be plumbed up as a single or double valve set up