I'm about to put together a parts list for a CO2 scrubber. I just bought a couple of 3/8" barbs and was planning on using silicone tubing. I'm starting to think I should be sizing down on tubing compared to the barb to get a tighter seal. Ie using 1/4" tubing and 3/8" barbs to get the tightest seal (or 3/8" tubing and 1/2" barbs more appropriately to get less resistance with airflow). I'm thinking if I use 3/8" barbs and 3/8" tubing I may get some air leakage. Thoughts?