Vintage Double Hose

I do not think this is a scubapro 2nd but it does have many similarities.

Cool!

Lot of concepts seen in the early 60's ScubAir series......

Prototype?

I do see it with the case in this example:

I think I have a similar Scubapro in route in a bulk buy of parts I made...If I remember correctly, a company called IDI out of California made a regulator that had a similar tube / venturi configuration like the one above in the early 80s. I worked at a store that carried them as a 3rd tier regulator brand. They also made the IDI power fin which was popular because it copied the jet fin and had a huge xl fin that worked well with the boots that were becoming popular on drysuits. The Turtle fin pocket was a copy of theirs i think.
Herman, if you are reading this, do these regulators take the same main diaphragm as the early Healthways we were discussing? If so I could reproduce it as it would obviously fit the Healthways and the Scubapro 108s. Guess you better send me that diaphragm if the offer is still open?

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Healthways diaphragm are bigger. I can send some to you that I saved from a Scubair and Scuab star

It will fit the Scubair, no clue on the Scubapro in the first of the thread, odds are a standard SP will work on it.
And yes the offer is still good, I will ship it to you .

Brian mentioned IDI regulators "Skin Diver"magazine ran a piece on their unit "Scuba Star 11 issue May 1982 which covers that second stage configuration.

I am going to say it may be a predecessor to the 11-08x-000 High Performance Second Stage. Differences are there for sure but the pedigree is clear to me. That venturi tube is not present in the pics and drawings I have giving me the thought of a predecessor or maybe even an evolution model that did not make the grade.

It is 100% not a 'Scubapro but possibly a knockoff. At the time when Scubapro introduced the large exhaust - they used to stamp the Serial number between mouthpiece Barrel and exhaust. There was never a venturi pipe inside the second stage.