Compressor operator operates and monitors steam, gas, electric motor, or internal combustion-engine driven compressors. He/she starts the power unit and builds up required pressure, manipulates controls or sets the automatic regulator to maintain a supply of air to equipment, observes pressure, temperature and other gauges and makes further adjustments to control as necessary. He/she cleans and oils equipment, tightens loose parts and performs other servicing tasks to keep the compressor in good running order.