Instrumentation & controls offers a wide range of air hydropower pump units as pressure testing pumps suitable for use in various industrial applications like hydraulic pressure testing of rubber hoses and fittings, valves and pipe works, gas cylinders, boilers, pressure vessels, fire extinguishers, fuel valves, aircraft systems, submarine cables and radiators; hydraulic pressure for pressure operation, rock bursting, bridge building, tube fining, bolt tensioning, hydro forming, iso-static pressure, etc; pressure charging of scent, chemical, gases, etc, in bottle or vessels; boosting up of shop air pressure to 300 psi and above. Special features: light weight mini models available for portable use; compact design; versatile in applications; fingertip control; no manual effort; very wide pressure range in one model; automatic sleep start [stops when pressure reaches to the set value and start when pressures goes below its settings; very safe in operation and in use; no air consumption and subsequently no power consumption when pump is stalled when it reaches its maximum pressure. It can be used in hazardous conditions too where electric power cannot be used.