Abstract: The present invention provides a portable source of high pressure gas that may be used by service or construction workers. A portable high pressure cylinder is filled with liquid CO.sub.2. A triggering device is threadably connected to a fitting on the upper portion of the cylinder, which fitting contains a high pressure press release valve and an over-pressure relief valve. A unitary housing for the triggering device contains all of the other internal working parts, including the push plate, plunger, and other components for a simplistic, easily usable source of pressurized gas. A belt clip allows the workmen to carry the source of pressurized gas with them for ease of use in their jobs.