Grex Genesis.XB Double Action Bottom Siphon Airbrush, 0.3mm Nozzle, 30ml Bottle Bottom plug-in siphon feed bottles for quick color changes and improved line of sight Internally mixed, cutting edge design for precise control of fine detailed work Replaceable solvent proof teflon seals, precision machined stainless steel nozzle and needle Convenient to clean design with short passageway from cup to nozzle for responsive feel Preset adjustment knob for precise paint volume control