Increase Customer Satisfaction TheNAPA Tru'Flaw POWERCLEANW Flush Tool cleans engine cooling systems completely and thoroughly. Cooling systems can be difficult to flush completely due to large amounts of accumulated debris from parts erosion, system neglect, incorrect or non-compatible coolants, and other problems. Inadequate flushing can ruin a newly installed water pump, heater core, radiator or thermostat and result in comebacks and frustrated customers. Make sure you perform a complete cooling system flush by using the NAPA Tru-Flow POWERCLEAN" Flush Tool with patented pulsing technology.