Manually-operated hydraulic power source for moderate-size fixtures. Two-stage Hand Pumps provide faster pressurization than single-stage pumps, with automatic switching from 850-psi low stage to 7500-psi high stage. Compact and portable. Totally self-contained. Easily adjustable pressure setting. Pump and release with the same lever. Excellent service life because internal components are virtually wear-free. Hand Pumps are suitable for smaller clamping fixtures and assembly operations where automatic pressure control is not required. Hand operation is ideal when extra "feel" is required for assembly and/or test fixtures.