4300-09 - RX-11 Flush Kit for 3-4 Tons - 1 lb CanisterNu Calgon 4300 09 RX 11 Flush Kit for 3 4 Tons 1 lb Canister 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