OT, I make my own tanks out of Polypropylene Tubing and Silicone grommets. You can cut the tank to fit regular cartos, but I have mine fitting Boge XL's.
from: McMaster-Carr
1 1061T83 1 Pack Push-in High-temperature Flexible Grommet, An931-930-1, 3/8" Id, 11/16" Od
2 5392K17 1 Ft. Rigid White...