Enerpac hollow plunger cylinders allow for both pull and push forcesRelief valves prevent damage in case of over-pressurizationBaked enamel finish for increased corrosion resistanceCollar threads enable easy fixturing (except RRH-1001 and RRH-1508)Double-acting cylinder version for fast hydraulic retractionNickel-plated, floating center tube increases product lifeCR-400 coupler and dust cap included on all hollow plunger modelsPlunger wiper reduces contamination, extending cylinder life