Organomation Multivap OA-SYS 113, 49 Position Analytical Nitrogen Evaporator. Needles or glass inlets blow gas onto the surface of solutions resulting in rapid evaporation of the solvent. Can load up to 49 test tubes (10mm-30mm diameter) in a stainless steel rack. Features standard 4â€ x 19 gauge needles. The stainless steel water bath can be thermostatically controlled and maintain temperature from 30Â°C-70Â°C, and is equipped with a water-level device and high-temperature limit switch.