3.5" Sterling Extruder, 30:1 L/D, 150 HP, DC Drive, Year 1991 1991 Sterling Vented:  Yes Drive Mfg:  Carotron Elite Pro Drive Type:  DC Cooled:  Water Screw Type:  Styrene Powder Upgrades:  Drive, Thrust Bearing, Screw Products:  Styrene...