The original one I made based on 2 inch clear acrylic I pick up in the FS/FT forum. It dictated the use of 1 1/2 PVC parts, and I wanted something that would bolt through the top, but of course the outlets would have to point down. It's basically a tee, with a bend.
Like I wrote earlier, it actually clears all air in 10 seconds, so the concept works.
Now I'll be re-building it at about half the size!
Here's an old "fitted" pic:
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