Rx11-flush is a unique solvent that has been engineered for Flushing refrigeration and air conditioning systems | its patented huff based solvent formulation is powerful enough to flush away sludge, carbon residue, oils, acids, water and other particulate | ideal for system Flushing after burnouts, retrofits and for Flushing line sets for R-410A conversions | it is non-toxic, non-flammable and is non-ozone depleting - rx-11 flush kit 3-4 Ton - 952469 - manufacturer part number: 4300-09 - manufacturer: Nu colon.