Nu-Calgon 4057-55 A/C Re-New refrigeration lubricant additive, 4 oz unpressurized can. Blends with system oil to quiet compressors, reduce energy use, and improve heat transfer; treats systems up to 5 tons. Installed with the 4057-99 A/C Re-New injector (sold separately). Compatible with R-22, R-407C, and R-410A.
