4300-08 - RX-11-Flush Starter KitNu Calgon 4300 08 RX 11 Flush Starter Kit 2466014 Rx11 flush is a unique solvent that has been engineered for flushing refrigeration and air conditioning systems. Its patented HFC based solvent formulation is powerful enough to flush away sludge, carbon residue, oils, acids, water and other particulate. This makes it ideal for system flushing after burnouts, retrofits and for flushing line sets for R 410A conversions. It is non toxic, non flammable