HI14-RF-300 RF RF-300 RF300 300ML RADIATOR FLUSH Hi-Tec Radiator Flush is an environmentally safe and biodegradable cooling system rejuvenator that removes rust, scale, dirt and debris from radiators, water pumps, water jackets, engine blocks and, cylinder heads. Hi-Tec Radiator Flush is a non acidic, non toxic cleaner safe for all systems and is safe on joints, rubbers, seals and gaskets. It is suitable for cars, trucks, tractors and wherever radiator flushing is required.