elmer fudd
Contributor
I think I might just buy one and try compensating and venting in the old fashioned way first and then if I can't get that right add valves later.
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Personally, I'd like to know more about those Slovenian pioneers of diving you mention, and the gear they designed. Our vintage forum has so many experts on the American history of diving. We don't have enough contributors able and willing to post information about diving history on the European side of the Atlantic. Feel free to start a new thread about early scuba and snorkelling in your own country.
I think I might just buy one and try compensating and venting in the old fashioned way first and then if I can't get that right add valves later.