The Stream Air was a 1950s US Divers regulator.  It was one of the first if not the first to have tabs holding on the label and a one piece label side can.  It was a good breather, but was replaced by the Mistral.  The Mistral was essentially the same regulator, but with a different venturi nozzle.  Some Stream Airs were upgraded with the new nozzle and this can be still done today.  These new nozzles are available at VDH Venturi Nozzle for a small price.  This Stream Air has in fact been upgraded by complete with a brand new venturi nozzle.

Click here to see the Stream Air in action.