The metabo HPT is one of the compressors in the lab

Fittings for the compressor are found in the blue shelves; the compressor uses Quick Connect connectors with adapters to threaded components

Note: if the compressor does not turn on, it is recommended to first try to drain the tank by slowly opening the valve on the underside of the tank-place a container underneath the valve opening to collect any condensation contained within the tank (you can slowly tilt the compressor to drain any fluid)

Other troubleshooting details are available here