Model: HBM3341 Series: Larzep Product Line: Industrial Tools. Product Features Manual directional control valves. The manual control valve is easily converted from double acting to single acting operation. Internal safety valve set at 700 bar to prevent overpressure. External adjustable pressure relief valve. For use with single acting or double acting cylinders for heavy lifting or production applications. Options: roll bars, glycerine pressure gauge and push button remote motor control. NOTE: Pressure gauge is not included.