Link Suspension (Formerly Hadley) Valves are the choice of vehicle manufacturers and fleets because of their proven performance. Whether it’s our 450, 500, 600 or 650 series of classic valves, or our next generation height control valves you will enjoy significant benefits.

height control valves are engineered to be the most reliable valves on the road. Counterfeit valves are not built to the same standards, do not meet the same specifications, and do not perform as well or last as long as a genuine Hadley valve.

Genuine Link/Hadley Means Superior Performance

  • Superior lubricants with proven and consistent lubrication to protect the valve
  • Proven O-ring seal integrity throughout the life of the valve
  • Counterfeit valves require frequent replacement due to excessive wear and tear
  • Hadley leveling valves are designed with 37 years of leveling valve technology
  • Chosen by OEMs more often than any other valve brand
  • Engineered to outlast all other leveling valves
  • Made in the USA