HECAT HD ENGINE COOLING PULSATOR KIT (118550HD)- Engine Cooling Pulsator with 4 inch HD Radiator Cone The HD ENGINE COOLING PULSATOR is a Complete Engine Cooling System Flush Kit. Stop Repeat Cooling System Problems and Equipment Downtime. Stop Repeat Water Pump Failures, Parts Erosion, and Erratic Cooling Issues. Fix the NO HEAT and Clogging Core Issues. Made in USA