Airbrush Airflow Adjustment Control Valve Air Hose Quick Release 1/8" BSP Adaptor Fitting Coupling Connector Airbrush Tool
https://www.vogueparade.com/shopping/EN/1417/1/1005003626068504/airbrush-airflow-adjustment-control-valve-air-hose-quick-release-18-bsp-adaptor-fitting-coupling-connector-airbrush-tool//