Another update:
for those looking for an easy/cheap way to reduce the 3/4" connection down to 1/2", I found something dirt cheap, at a local hardware store that'll work.
Forney Industries p/n 72396.
It's actually a reducing bushing for grinding wheels, almost 1" long. It's composed of three hollow cylinders, that fit within each other. The smallest ring has an OD of 5/8". The middle is 3/4" OD, and the outer one is 1".
By "Goop" 'ing the appropriate sizes together, one can make a cheap reducer. You could even adapt 1" ID tubing, if you really needed to!
I picked it up on sale for $0.25 each.
There's also p/n 72395, but it's not quite as long: almost 3/4".
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