Additel ADT 927 High Pressure Test Pump, 85% Vacuum to 10,000 psi (700 bar). The 927 Hydraulic Pressure Test Pump is a hand operated pressure pump designed to generate pressure from 85%vacuum to 10,000 psi (700 bar). With the patented screw press technology, high pressures can be easily generated, aswell as increased and decreased smoothly. With no check valve (non-returning valve), the 927 avoids the troublesomeleakage issues that is usually experienced with most hand pumps and allows for minimal maintenance. Two hand-tightquick connectors installed on the pump allow easy connecting and disconnecting to the test pump without the needfor PTFE tape or wrenches. The 927 is an ideal comparison test pump for calibrating pressure measuring instrumentssuch as test gauges, indicators or transducers in the field or laboratory.