ShakaZulu
Contributor
I like the one from Cressi-Sub with the purge valve, works great at 500ft, and you can breathe upside down.
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Ah yes, excellent point. I forgot that a lot of snorkels have their one-way valves rather exposed, while others hide them inside this contraption where it's nigh impossible to get your fingers in and clean out goo.spectrum:The purge valve is also usually in the deal on a better snorkel. What I have found important is that the valve be concealed in some sort of caged recess. Otherwise I have had some where the valve could be over ridden when turning your head quickly. If I happened to be inhaling I'd get a surprise. The caged pocket isolated the supple valve from most of the water force.