Or do as I have done on any acrylic that needs a barb... use acrylic tube that is over sized.
You will need to sand a taper on the tip so you can force the tube over it. This makes a VERY tight seal for the tube (read: no clamps) and is easy to seal to the acrylic... just glue it.
I always drill the hole the same size as outer diameter as the tube and then glue it in the hole.
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MMZ>TimeLord
"Oooooooooh... that's gonna leave a mark!"
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