technician are soldering a coil with copper in order to fix leakage of air compressor. this is a oil and piping problem of air-con

air aircon airconditioner and are background brass closeup coil compressor con connection construction contractor copper design dirty equipment fan fitting fix flux gas hand handyman hardware home hot house industrial industry job leakage man mechanic metal oil order pipe piping problem repair shiny solder soldering supply technician this tools tube unit water weld work worker