1000/400/500 Series MIL-C-4109 Industrial Interchange Air Swing Coupling, Female Half With Safety Vent, -08 Coupling, 1/2-14 Female NPT

A protective collar helps prevent accidental snagging and unintentional disconnection. Plus, it's got a pin latching mechanism for extra security.

Safe automatic venting of trapped air happens during the disconnect process, so you're not getting a sudden pressure release all at once. The swing coupling design lets you retract the release sleeve and swing the assembly to an angled position, which bleeds off the pressure in a controlled way before the halves fully separate. That's one of the main reasons this series gets used in air tool applications where you'd rather not have pressurized air kicking back at you every time you break a connection.