Cast Steel Universal Air Hose Coupling, 3/4 Inch Female NPT

It’s a 3/4 inch Female NPT threaded universal air hose coupling, so it matches a 3/4 inch male NPT connection.

Standard rubber washer in this fitting handles down to negative 20 degrees Fahrenheit, so typical winter conditions won't be a problem. Upper end cuts off at 160 degrees Fahrenheit, which covers most ambient outdoor and shop environments just fine. Keep in mind that's with the rubber seal it comes with. Swap out that washer for something else and those numbers no longer apply.

These universal air hose couplings are designed for air and water service, and they're rated to 150 PSI at 70°F, so they should be suitable if your wrench operates within those parameters.