This unit is a screw in, cartridge style, plunger type, push to pressurize or pull to pressurize, hydraulic manual hand pump. This hand pump allows free flow from port 1 to port 2 when plunger is pulled out and pressurize port 2 when plunger is pushed in. Handle position can be rotated 360° around the verticle axis. Specifications: Operating Pressure: 5,000 PSI (350 Bar) Flow - 4 CC per Stroke Valve Housings: 2,500 PSI (210 Bar) = Aluminum 5,000 PSI (350 Bar) = Steel