Tailored specifically for wear resistance and long life in pressurized heat transfer oil circulation service for plastic injection molding and other industries. They are industrial units designed to handle fluctuating temperature cycles pumping Therminol ®, Dowtherm ® , Paratherm ® and others at elevated temperatures to 450 °F, at pressures up to 100 psi, and at shaft speeds to 1750 RPM. Shafts are hardened steel. Gears are high-strength durable Fatigue Proof ® steel. Rugged ductile iron housings. High-grade carbon-graphite bushing style bearings and thrust plates are used. The shaft seal is a bellows style mechanical seal with fluoroelastomer elastomer bellows and o-ring and with carbon and ceramic wear faces. No stuffing box cooling necessary. Contact Factory for 550 °F option.