Just a thought, I made my "Y" out of 1'' Plexiglass block, If you can get Plexi ( I can get the thick stuff locally and as long as it is just scrap pieces it cost me little to nothing), My problem was I felt the "t" was too restrictive so I made a "Y" and as far as sizes since you are making it yourself you can tap it to any size you need.
Just my 2 coppers worth
Aardil
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