Electric hydrostatic test pumps are designed for pressure testing water systems such as water meters, plumbing lines, pressure vessels, solar systems and sprinkler systems, in both residential and commercial buildings. The output pressure is easily adjusted by turning a knob and watching the attached gauge. A built-in bypass allows for automatic water recirculation once the set pressure is reached. The hose-to-pump connection features a quick disconnect with built-in check valve, which allows for convenient setup and portability. Durable pump has stainless steel piston and brass cylinder for long pump life.