Danner 3.
Since the inlet is 5/8", and the outlet is 7/16" ID x 3/4" OD, I was just gonna drill out the outlet to 5/8". I mean... Why not?
I mean heck, even when you get 1/2" barbs, you're still not getting a 1/2" hole. With my 5/8" barbs, you only get a 15/32" inside diameter hole. I mean yeah, it's 1/32" less than 1/2", but it's still not a half inch

*sob*
This was as big as I figured you could really go... Mainly because I'd have to pipe the tubing, and I just wanna use barbs and flexable 5/8" ID tubing. I am using nylon reinforced tubing though, to give it rigidity and not kink as much.