FWIW...
I say ignore the tubing too, but I'd add a recommended tube size, based on the expected flow rate, to minimize the pressure drop.
It's a simple calculation, and leaves few choices: 1/4, 3/8, 1/2, 5/8 (rare) and 3/4. If anyone wants to run a flow rate higher than norm, then the calc can simply state: "too high", i.e. do it yourself.
Bill's right, adding fittings can be simple. On the other hand, one could simply design a spreadsheet to download, so one can simply plug in their own numbers...
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