Item Details. Used Extruder Technologies twin screw extruder, model ET-003, stainless steel construction, 3 mm diameter barrel, requires set of screws, 30:1 L/D, electrically heated, water cooled, split barrel design, (2) plugged vent ports, 2 barrel zone, 1 feed zone, 500 RPM screw speed, 1/2 hp 230/460 volt motor with Allen Bradley AC