Ever have an air line or tool go shooting off accidentally when you disconnect it? Besides being dangerous, it could damage the connector as it whacks the ground. To prevent this uncontrolled reaction, safety couplers like this one from Milton Industries make connection and disconnection a two-stage process.
Several retailers of the safety coupler describe the operation as follows: “First click locks coupler and plug; second click engages air pressure. When disconnecting, first click will relieve air pressure; second click allows coupler and plug to be safely disengaged.” Not having laid our hands on one yet, this sounds a little vague. Has anyone used one that could provide a better explanation of how the coupler works?
This 1/4″ M-style safety coupler comes in either male and female 1/4″ NPT threads. Milton retails the safety couplers for $10.