The Tristar houses a rotating drum which has an 'Archimedes' continuous screw fitted to the internal wall. This means that as the drum rotates, the turning of the screw moves the parts forwards. The parts go through either three or four stages within the drum depending on the machine chosen. These machines have been developed to provide a continuous throughput of parts that need to be degreased, rinsed and dried in large quantities. The standard three stage model includes immersion, wash & dry, in addition four & five stage models are available which can include rinsing & extra drying stages. Drum diameters available from 300mm - 700mm.