Good question!....
I can't readily tell you, but normally, on the newer ones, you will see a plug somewhere on the pump that is about the same size as the fitting of a garden hose. You normally have to buy a quick snap connecter to make it easy.
You may think about buying a "radiator flush out kit" at your local auto parts. Then, take the "t" and where your water line comes from the pump to the top of the engines head cover, cut the line in the middle and put the "t" in. Then, you'll have a place to screw on your hose. And a cap to secure it with when not in use.