GotHobby Airbrush Quick Release Disconnect Coupling Coupler with MAC Valve, 1/8 Condition: Brand new The quick-release action allows you to quickly change airbrushes when you use multiple airbrushes with a single air supply hose. Mounts inline between the Airbrush and Air hose. 1/8 BSP Micro Air Control (MAC) valve, easily adjusting the amount of air flow going through the connector.