Enerpac hollow aluminum cylinders are a lightweight solution for tensioning and testing. Hollow plunger design allows for both pull and pushes forces. Composite bearings increase cylinder life and side load resistance. Hard coat finish on all surfaces resists damage and extends cylinder life. Handles included on all models. The floating center tube increases seal life. Steel base plate and saddle for protection against load-induced damage. Integral stop ring prevents plunger over-travel and is capable of withstanding the full cylinder capacity. High-strength return spring for rapid cylinder retraction.