These quality hose fittings add the convenience of a quick release system between your airbrush and compressor. The fittings allow you to quickly and easily disconnect and reconnect other air tools. They male bayonet is a push-fit with a positive locking action. The female coupler has a male 1/8" BSP thread. The male bayonet connectors have female 1/8" BSP threads. The pack comprises 4 bayonet connectors and one coupler.