Abstract: A compact, lightweight, portable cryogenic system for powering small pneumatic hand tools. A unitary manifold for providing a fluid fill path and a fluid vent path is mounted to the upper surface of a small dewar for containing a cryogenic liquid under pressure. The manifold is provided with partially threaded inner passageways for externally mounting a vent valve, pressure gauge and first relief valve, and for internally mounting a fill check valve and an economizer check valve. The economizer check valve is coupled to the inlet of a small heat exchanger comprising a length of finned tubing coiled in a stack about the manifold on top of the dewar and prevents back-flow of fluid to the dewar. A pneumatic circuit breaker valve coupled between the outlet of the heat exchanger and the inlet of a pneumatic hose having a disconnect valve at the outlet enables small pneumatic hand tools to be removably connected to the pneumatic hose and powered by cryogenic liquid vaporized in the heat exchanger.