The stainless-steel injector is a compact, light-weight unit which operates on liquefied petroleum gas, eliminating the need of an air compressor and the stainless-steel reduces the amount of corrosion attributable to acetic acid from bubbler samples. The unit includes the aspirator, a pressure regulator, gas filter, 0-30 psi gauge to indicate the jet pressure, and a 0-250 psi gauge for supply tank pressure. To determine the optimum jet and throat diameters, three different jets, and three different throats were made up and the nine combinations were tested experimentally using a propane-butane mixture. A cross-section of the aspirator, and a drawing of the complete unit are given. The most promising use of the device is for sampling with impacting samplers for aerosols.