Additel ADT 937 [ADT937-N2] Hydraulic High Pressure Calibration Pump, 1/2 NPT Female, 15,000 psi (1000bar) - Skydrol Oil. The Additel ADT937N High Pressure Hydraulic Calibration Pump, 15,000 psi, 1/4 NPT (F) - Phosphoric Acid Ester Fluid and Skydrol Oil is a hand operated pressure pump designed for calibrating pressure measuring instruments with phosphoric acid ester fluid and Skydrol oil in the range from 85% vacuum to 15,000 psi (1000 bar). With the patented screw press technology, high pressures can be easily generated, increased and decreased smoothly. A specially designed shut-off valve makes the pressure as stable as possible during calibration. With no check valve (non-returning valve), the ADT937-N avoids the troublesome leakage issues that is usually experienced with hand pumps and allows for minimal maintenance. Three hand-tight quick connectors installed on the pump allow easy connecting and disconnecting to the test pump without the need for PTFE tape or wrenches. The ADT937-N is an ideal comparison test pump for calibrating pressure measuring instruments such as test gauges, indicators or transducers in the laboratory.