Review on 🔌 Versatile, High-Quality Airline Tubing for Aquariums, Terrariums, and Hydroponics: Professional, Durable & Clear by Katie Parker

Not bad catenary, but not perfect. The length looks something like this, a foot or so, but I haven't actually measured it. The main disadvantage is the rigidity of the plastic, or perhaps its size. I ended up having to heat the ends with a lighter to soften them enough to slide over the fittings. Maybe I just got an old one from Revain and the plastic has started to harden. Also, it took more than a week for the curves to get out of line. On the plus side, all of my air connections are very tight. a step I don't have to do with the other lines. In the end I am satisfied and will buy more.