AUTOMATIC TRANSMISSION COOLER LINE SOLVENT FLUSHING SOLUTION in a convenient 12 oz. aerosol can. For removing all types of contaminates and build-up including: worn or ground metal, metal grit or particles, build-up of worn converter parts, worn converter and transmission clutch material, old, burnt, dirty ATF, varnish, gum and dirt build-up etc., from the cooler lines whenever the torque converter or transmission is replaced. Note: Replacement of the Transmission Cooler and Flushing of the cooler lines with cooler line solvent flushing solution (including the radiator bottom cooler line) is MANDATORY whenever the Torque Converter or Transmission is replaced to prevent repeat failure due to leftover contamination. We also recommend installing Our Cooler Line Filters. Thank You.