I believe the T is 3/4 inch on the ends and the screw top is 1/2 inch or @least that's what I used. The brass pieces I just lined up at the shop, not sure but I think 1/2 to 1/8th inch and then the 1/8th inch nipple.
I guess my Home Depot and Lowes suck lmfao. If I could piece that together I'm set. I also need to decide if I want to try to fit my 5/8" hose over the 3/4" fitting or clamp it down to the 1/2".