Aluminum Cam & Groove Coupler, Female Half, 1 Inch Female NPT

Once the adapter is seated and the cam levers are pressed down, you run the safety pins through cast-in lugs on the coupler body. Those lugs line up with slots in the cam lever arms, and with the pins in place, the levers physically cannot lift. Nothing comes loose until someone pulls those pins out on purpose. It's a real straightforward mechanical lock, not just a friction fit.

With a 1 inch female NPT connection on the back end, it threads onto a matching 1 inch male NPT fitting.