Designed to be lightweight and compact. Pressure resistance test is 100% of lifting capacity, allowable lateral load is 1/20 of lifting capacity. Sliding portion of Piston is made from copper alloy and Piston rod is made hard chromium electroplating. Cylinder, Piston are heat treated SCM435 steels. Port thread of coupling is NPT3/8. Install fall prevention valve to prevent the load from falling even if piping, hose gets damaged. Consider a use of safety valve for jack, if necessary, not to block the return circuit of a double-acting jack. For hydraulic jack with handle for hydraulic return, there are 3 items of E30H20, E30H35, E50H15.