Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
I heard it first in Ohio, later in the Great Lakes and N. Florida so it was more widespread. Dr. Benjamin was Canadian.I suspect the "Benjamin" terminology was probably unique to N FL.
Maybe I should post this in the tech section, but I am curious as to what one of these looks like. Early cave divers used them, and they are incorrectly listed in many books as being the first manifold with which to double up tanks (even though Aqualung did that in 1953). Does anyone have a picture of what the Benjamin manifold looks like?