Reed's HTP300 is a Hydrostatic Test Pump. It has a 300 PSI capacity. It weighs 8.6 lbs. This pump is designed to test water meters, plumbing lines, pressure vessels, solar systems, and sprinkler systems, in both residential and commercial buildings. It is portable and can be used to test modest irrigation lines. The pump operation requires the user to first fill the system that needs to be tested; next, the user raises the system pressure by actuating the test pump handle; and finally, the user closes the pump's ball valve at the desired pressure. The user determines leakage based on dropping pressure as indicated by the hydrostatic test pump's pressure gauge. The pump has a relief valve that reduces the likelihood of over-pressuring the system, and the hoses are sold separately.