The HP-35/20 model is a pneumatic driven hydrostatic test pump with a pressure range of 200 to 2000 PSI, with a flow rate of 3.5 GPM. Lightweight at 50 pounds and portable this unit is ideal for testing in small confined spaces and remote locations. Designed for testing oil, gas, water and steam lines; such as onboard ships, oil rigs and refineries. This unit has the ability to start/stop while under pressure, and is capable of handling various fuels, oils and chemicals.