GASCO R407A 103L-R407A 901 PPM Refrigerant R125 Pentafluoroethane, 1039 PPM Refrigerant R32 Difluoromethane, 1060 PPM Refrigerant R134A Tetrafloroethane, Balance Nitrogen contained 105 cylinder With a C-10 connection, For Use with Any and All Gas Detectors, Cylinder connection C-10, Calibration Certificate NIST, Made in the USA, Calibration Refrigerant Gas is intended for use in Calibrating Refrigerant Gas Detection Equipment Only. NOT INTENDED FOR CHARGING Air CONDITIONING EQUIPMENT