The 108 was the first "own" Scubapro second stage and was introduced during 1963. As this stage was often sold with the first stage MK 2, this stage is often called "Mark 2. Feature of the early stages: strange exhaust tee from rubber and a round outlet in the housing for the bubbles.
While introducing the MK 9 first stage in 1981, this stage was improved. The new version is called H.P. (High Performance) and was revised in several points: The air outlet was increased like the one from 109. The new valve seat is adjustable like the 109. The last units were sold in the 90s. They were made with matted housings. The combination MK 5 first stage and H.P. second stage was offered as "Mark 4" in the catalog.
Of course there was a conversion kit 108 to H.P. but it isn´t available any more. As the single parts are still available you can still upgrade..
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