Thanks. I just went to the hardware store and starting fitting stuff together until I found something that worked. What I didn't show was the other side. That 1.25" PVC leads to a 1.25" slip to thread adapter, then I have a 1.25" barb connection in there. The barb was just a little too small for the pool hose I wanted to use, so I wrapped the barb end in teflon tape until I had the thickness I wanted. Then I put the pool hose on and tightened. Seems to work perfectly. Good enough that I canceled the order for the 40mm to 1.25" adapter I ordered.
Only thing I'm noticing about the skimmer so far is, I really don't like the ball valve that much. My ASM G1X has the gate valve modification, and that gate valve allows very precise level control. I can't get that same kind of control with the ball valve. A tiny turn of the valve results in a big level change. If someone can either find a metric gate valve, or get a 1.25" gate valve on this thing, it would be awesome.