Simply push down on the QuickFit Air Hose Adaptor to release the airbrush.
Iwata QuickFit Quick Disconnect Set for Hose/Airbrush (1/8 BSP)
E-QDP-1/8 Iwata QuickFit Quick Disconnect Airbrush Adaptor 1/8 BSP
Iwata QuickFit Quick Disconnect Hose Airbrush Adaptor (1/8 BSP) E-QD1
Quick Disconnect Bayonet Plug (1/4 BSP) E-QDP-1/4
Quick Disconnect Set (with Air Valve) for Hose/Airbrush (1/8 BSP) Z-QDVALVE-1/8
Quick Disconnect Compressor Coupling Body (1/4 BSP) E-QD2