This 5-liter manual pressure testing pump is a self-contained, portable hydrostatic tester designed for checking leaks in residential and commercial plumbing installations, heating networks, and solar systems. It provides a reliable method for pressurizing pipelines, valves, and vessels to ensure complete structural and joint integrity before commission. Featuring a durable reservoir, integrated pressure gauge, and robust twin-valve system, this manual pump allows for accurate pressure buildup, stable holding, and precise adjustment during inspection procedures.