Review on Master Airbrush Quick Release Coupler & Plug with Airflow Control Valve - 1/8 in. BSP Male and Female Connections by Heather Shaw

The female end is poorly threaded and will not allow the airbrush to be fully (not even halfway) screwed in and air can escape. The airbrush should at least make contact with the inner seal. Do not use Teflon tape. I won't try to stuff it in as I believe the metal on both the Master Airbrush and the connector is probably a cheap alloy. There was also an opinion that it was a staple and not a generic or third-party product. The packaging definitely screams banal. return for refund.