Smoke Wizard GLD011 Inert Gas Pack spare cylinder – 20 oz. with Pin Valve. The GLD011 Performs approximately 25 EVAP tests per cylinder. (Cylinder arrives empty.)Smoke Wizard is a new generation (G3) automotive diagnostic smoke machine combining pressure and vacuum style Evaporative Emission (EVAP) System leak detection capabilities, and general purpose leak detector functions together in a compact design that stores in your tool box, even on its back or side.Smoke Wizard GLD40 is the premiere evap leak detector on the market.