A portable apparatus that can be temporarily attached to plumbing angle stop valves and the like, for the purposes of: (i) providing a controlled supply of water for repair and construction operations in a building; and (ii) testing for leaks in plumbing systems. This invention consists of the following components as depicted in FIGS. 1 through 4. Control unit consists of manifold interconnected with valve. Gauge is mounted into gauge port. Inlet pipe is attached to inlet port via matching threaded ends. Posterior end of inlet hose connects to inlet pipe via supply fitting. Anterior end of inlet hose can be attached onto a plumbing angle stop valve via supply fitting; said fitting has circumferential finger grips to facilitate attachment/removal without tools. Outlet port has outlet pipe mounted via matching threaded ends; said pipe can be fabricated in a straight or curved configuration. Quick-disconnect snap coupler can be installed between inlet pipe and inlet fitting as an alternate connection means. Quick-disconnect snap coupler can also be installed between outlet pipe and outlet fitting as an alternate connection means. To use the device, all components are interconnected as described and valve handle is rotated to the closed position. Supply fitting is attached to outlet of closed stop valve. Opening stop valve pressurizes manifold, allowing plumbing water pressure measurement via the gauge. Opening valve handle allows water to flow through device and exit end fitting. Garden hose or implements can be attached to end fitting to extend range of supplied water or employ task-specific tools.