FJC 2128 A/C Flush Solvent - 1 Gallon Compatible with Mineral, Ester, Paraffin and PAG oils Removes moisture, acid and contaminants that can block the flow of oil and refrigerants 100 percent biodegradable, non-toxic and non-hazardous Stops current and inhibits future corrosion due to moisture and acid Prevents acid from forming and neutralizes any acid presently in the system