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Rookie Snorkel question incoming.


Oct 4, 2023
Just spent a nice weekend in 2-5ft waters experiencing my first taste of Snorkelling and absolutely loved it.
As an Engineering designer, I need to sate my curiosity about Snorkel design with this one question:
I could have done with another 4" on the length of my snorkel as looking underneath myself and the odd wave occasionally souped up the end.
It appears that Snorkel length is set in stone and here's the rub - I totally understand the tidal air concept and how dangerous it would be to rebreathe an increasing proportion of CO2 as a result of a longer Snorkel, BUT... in this wonderful age of plastic and silicon valves, why does this not exist...
** A twin-tube Snorkel with an in-tube (normal diameter but a few inches longer) and an out-tube (could be smaller) both tubes regulated by a valved mouthpiece? **

Now I get the potential drawback of not being able to purge the in-tube of water without some kind of manual or bite-down valve opener but what am I missing? this sounds cool :)

Thanks in advance for your time.