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The 938 Hydraulic High Pressure Test Pump is specially designed for calibrating oil-free pressure measuring instruments in the range of 85% vacuum to 15,000 psi (1,000 bar). All parts used in the pump have been carefully cleaned to remove oil. The pump uses water as the media. With the patented screw press technology, high pressures can be easily generated, as well as 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 938 avoids the troublesome leakage issues that is usually experienced with hand pumps and allows for minimal maintenance. Three hand-tight connectors installed on the pump allow easy connecting and disconnecting to the test pump without the need for PTFE tape or wrenches. The 938 is an ideal comparison test pump for calibrating oil-free pressure measuring instruments such as test gauges, indicators or transducers in the laboratory. Specification: ● Media:Deionized water ● Pressure Range: 85% vacuum to 15,000psi (1,000bar) positive pressure. ● Material Ram/adapters: SS Body: SS/aluminum Seals: Buna-N ● Connection Hand-tight connectors for both test gauge and reference gauge. Test Gauge Connection: 1/4NPT female, 1/4BSP female, M20X1.5 female Reference Gauge Connection: 1/4NPT female, 1/4BSP female, or M20X1.5 female ● Dimensions Height: 9.1" (230 mm) Base: 20.5" (520 mm) x 14.2" (360 mm) ● Weight:35.2 lb (16 kg).