The original size was to reduce the flow restriction. I wrote an article about it, but it didn't get published.:shrug:
The idea was to have an effective airtrap. The 1/2" tee that most people use is surprisingly restrictive, so I've rebuilt it using 3/4" parts.
With the old 1 1/2 parts, it cleared all the air within 10 seconds.
I'll be testing the new one this weekend, maybe.
The nice thing about it is that the end caps are screwed in, so you can replace the barbs to match whatever size hose you use.
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