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Kelderman Height Control Valves can be used by many applications and are designed to maintain the proper ride height of Kelderman Air Suspension Systems. They attach to the framework of the suspension, inflating or deflating the air bag(s) as needed. It automatically turns when weight is added to the truck, and as a result of this change, the air from the bags will flow into the tank until it returns to its original position. This “self-leveling” accessory will automatically adjust your airbags to the optimum ride height according to weight.