The HP-6/500 model is a pneumatic driven hydrostatic test pump with a pressure range of 50 to 500 PSI, with a flow rate of 6 GPM. Lightweight at under 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.