It's just a barb with an awfully restrictive tube.
The more I think about this tube in elbow thing, the less I like it. The purpose of putting the tube over the fitting is so that it can be clamped, and you just can't do that with the tube inside. It leaves a weak interface, prone to leaks.
Even in my setup, I have to use hose clamps, otherwise I'll have an air leak, from the pump's suction.
The only alternative I see is rigid tubing (like PVC) with a nice PVC cement: solid as a rock.
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