DX Overpressure Breathing Regulator

This is the U.S. Divers Company DX Overpressure Breathing regulator. This was the first single stage U.S. Divers Company regulator, the predecessor of the Stream Air (and Jet Air) and the Mistral. It has been rebuilt, with new hoses, re-chromed boxes, and a later, Mistral extended yolk. But it retains the "hose-within-a-hose" concept for the Venturi. Fred Roberts said that the Mistral's orifice "approached" the performance of the DX Overpressure Breathing regulator, without the problems of this concept. This allowed a banjo fitting to be used for a submersible pressure gauge (which has been plugged in this photo).

SeaRat