Zipvap 24 Specifics about this evaporator: This is a 24 position heated evaporator. Heated gas and heated holder with a flow meter. Can accommodate 15 mm vials. Has 16 gauge SS needles with nylon luer hub. Also Available: Nickel plated SS Needles 120V 60 Hz and 220V 50 Hz also Available! ? Specifics about all heated evaporators: All are very cost efficient nitrogen analytical evaporators. They also offer a small footprint. Manifolds areinterchangeable. Digital temperature control of sample heater also heats and controls the evaporating gas. Manifolds deliver a controlled gas flow to all samples with a flow readout. A simple cap shuts off flow to unused spaces.