Actually Scubapro used to make special hoses with a star-shaped inner tube, which leave air passing even if tightly knotted - This at least here at Scubapro Italy. I think they are called the Superflow hoses.what makes you think Scubapro makes their own hoses? a hose is a hose, don't worry about who made it because there are only so many hose manufacturers out there, so many fitting manufacturers out there, and so many assemblers that put them together. The logo on the hose doesn't really matter
However now they probably reversed to a more "normal" inner tube, at last reading the description given here:
Scubapro Hoses Superflow
Scubapro Hoses Superflow - Low-pressure hose remains flexible at any water temperature. The inner bore is completely smooth and matches the internal bore of the regulator first stage for an unobstructed air flow.
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