industrial refrigeration systems comprising one or more of the following, evaporators, chillers, air coolers, heat exchangers, condensers, air cooled condensing units, separators for removing oil from gas, oil filters, reciprocating compressors, screw compressors, rotary compressors, stop valves, stop check valves, expansion valves, leak detectors and parts for each of the above, refrigerators, freezers for making ice and brine coolers for industrial use