Dave,
I'm not sure if that is a stock connection there or not. The guy who built the tank and did the original setup is an extrmemly good welder (that's what he's paid to do) so it looks like a stock weld, but I don't know. Where the hose goes on there, it is barbed for the hose/hoseclamp, so I think that maybe he did add that, but I've never looked at another persons system to see if it has that on there stock or not.
Sorry I'm not much help on that.
Josh