On Monday, April 9, 2018 at 3:05:36 AM UTC-4, wrote:
Using them prevents leaks later on, clamping the tubes.

Has anyone ever tried a short piece of shrink-sleeve - no longer than the barbed fitting on the instrument - over the tubing? Slip it into place and hit it with a hot-air gun. Should shrink uniformly before doing damage to the tubing.
Uli
'AS'