Glad you ask.
This particular airtrap uses 1 1/2 fittings, but I'm rebuilding it with 3/4 parts.
1 street elbow
1 tee
2 socket to thread adapters
The middle parts is acrylic tubing. I got 2" OD tubing here in the FS/FT forum. Unfortunately, the fitting's ID is 1 7/8, so I had to open up the fitting.
In 3/4 parts, it'll require a 1 inch OD tube, and will fit perfectly.
The trickest part is the refill point: I opted to use a flange. It bolts right on top of the case.
Of course you don't have to use clear acrylic: regular PVC (white) will work just fine.
With the 1 1/2 parts, it clears all air in ten seconds flat.
I wrote an article on it... not posted.
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