Anyone know where I can find one of these?

should be able to find it at lowes. I just bought a 1 1/2" and 2" 3 way Y like those. Worse case, you can buy a 3 way and cap one end.
 
I have never seen a 1" y I dont think its common, see the 1.5" fitting you bought murf is for a drain , the 1" stuff is all for pressure, and y's just arent common. If they do have them let us know here, I just couldnt find one when I was there plumbing my closed loop.
Chris
 
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