Martin Borsje wrote:

What comes in must go out!

Wherefore else holes in the fork tube ends (4x)?

Those holes have nothing to do with water. If you tried to weld or
braze a tube at both ends, the air inside would expand as you worked,
and would push out the brazing or welding you were doing. Those holes
provide pressure relief so that the brazing or welding would hold.

--

David L. Johnson

Let's not escape into mathematics. Let's stay with reality.
-- Michael Crichton