Apr 25, 2018 · Cold Feed (DSR) Rubber Extruders. Available in 2 1/2 inches (65mm) to 6 inches (150mm) with L/D ratios of 10.5:1, 12:1, 15:1, 17:1 and 20:1. Equipped with unique pneumatic roller feeder to compensate for feed strip variations. Multi-zone temperature control via double cast aluminum heater cooler.