Now granted, the ID is only about 1/4", BUT if you got two of these, and cut off the barb section, you could do this with 1/2" OD tubing (I've already checked, the 1/2" OD SS tubing I have is a perfect fit). That's my next project.
Nice build, ultimately I went with Stout tanks they have a dip tube assembly that has worked well. The dip tube is actually threaded on.
The smallest interior diameter that wort can flow through is 11mm (just short of a 1/2"), which is fine for me.
I am currently looking at their rotating fermentor dip tube, but I have question they need to answer first.