Profile: Composite Technologies, Inc. specializes in offering twin screw extruder replacement parts and replacement parts for pelletizers. Our replacement parts include open & closed barrels, combi barrels, screw shafts, screw tips and screw shaft couplings. We provide various types of vent plugs, vent ports and injection ports. Pelletizer parts include changer gears, stripper bars, seal rings, bedknife holders and upper feed roll bearing blocks.