To refill compressed air systems of newer HGVs with systems working with 10.5 and 12 bar as well as of older HGVs with maximum reservoir pressure of 8.5 bar. With an inlet pressure of 8 bar it is possible to have an outlet pressure of 16 bar. Delivery as complete kit with continously variable control device (lockable) and pressure gauge for outlet pressure, air supply pipe with supply connection for damaged HGV, plug connection for standard pneumatic coupling.