REDTEK A/C Refrigerant Recharge Kit with Gauge NEW LABEL, SAME GREAT PRODUCT!!! Operation: RED TEK A/C Refrigerant possesses similar volumetric refrigerating effects to R134a refrigerant. Operates at lower head pressures and offers improved cooling properties, performance and energy efficiency. Lower Cost: Energy savings up to 30%. Compatibility: Compatible with most common refrigeration materials and lubricants including R134a, metal components, mineral and synthetic(Ester and PAG) lubricants, seals, gaskets, hoses, compressors, and o-rings. Environment: 100% natural organic refrigerant, non-ozone depleting, non-global warming. Safety: Does not become caustic when contaminated with moisture or oxygen. Non-toxic, non-carcinogen, autoignition temperature above 1385F. No long term health risks have been attributed to RED TEK A/C refrigerant.