Abstract: A nozzle includes a body, a substantially rectangular foot, air slots and a flow restrictor. The body directs a stream of hot air into the substantially rectangular foot. The foot has a top and bottom surface that includes air slots. The foot also has an outlet across one end for the air flow. A flow restrictor is positioned in the foot, substantially along the outlet to create a back flow of pressure within the foot. The back flow of air causes an even distribution of air across the foot and out the air slots. Thus, increasing radiant heat across the surfaces of the foot.

Abstract: An imperforate clip is slidable on the air inlet housing in a diving regulator for movement over one of a plurality of valve outlet ports to adjust the ratio of the air flow into the breathing chamber to the air flow directly into the mouthpiece.

Abstract: A diver's buoyancy compensator employs a constant volume chamber which is controllably pressurized with air from the diver's SCUBA tank, and water is admitted to or emitted from the tank by a manually operated valve.