You are correct. The return water from the torch runs through your dinse power connector and then into your tank. I also found that several outlets sell these dinse connectors from too expensive down to reasonable. I'm not a big fan of any establishment that requires you to buy 10 items only if you need just one. Some of these outfits try to make you feel that it's a priveledge to do business with them.
Remember it's a 1/2 inch dinse connector.
So Long!
Everlast 250EX with cooler and WP20 Torch
Millermatic Mig Welder
Gas welding setup
A bunch of Snap-On tools
And a Brain