Abstract: Apparatus for use during open system diving to support underwater human respiration. In accordance with various embodiments, an open system breathing apparatus to support underwater human respiration includes a stage-2 regulator configured to supply air from an air source to an underwater diver, and a bubble diffuser adapted to receive exhaust air from the air/water separator. The bubble diffuser has an enclosed housing with a sidewall having a plurality of apertures extending therethrough and a plurality of external discharge tubes respectively coupled to the plurality of apertures and extending away from the sidewall to maintain bubble separation as the exhaust air exits the housing through the external discharge tubes as an array of bubbles into the surrounding water.

Abstract: Apparatus for use during open system diving to support underwater human respiration. In accordance with various embodiments, an air supply provides a supply of air along a supply conduit. A regulator is adapted for engagement with a diver's mouth to receive air from the supply during an inhale cycle and to direct a mixture of water and exhaust air away from the diver along an exhaust conduit during an exhale cycle. An air/water separator separates the exhaust air from the water in said mixture and directs the separated exhaust air through an exhaust air port. In some embodiments, a one-way stop valve is provided within the air/water separator to prevent back flow. In further embodiments, a bubble diffuser emits the exhaust air as a fine mist of bubbles into the surrounding water.

Abstract: Apparatus for shading a user's neck. In some embodiments, an apparatus comprises a laterally extending central portion configured to support a neckpiece to cover at least a portion of a neck of a user, and opposing leg portions which extend from the laterally extending central portion configured to engage a headwear to support said neckpiece adjacent said headwear. Each of the opposing leg portions is formed into a substantially G-shape that comprises a first flange configured to extend down between a first surface of an external panel of said headwear and an upturned interior hatband of said headwear; a second flange in overlapping relation to the first flange, the second flange configured to extend up against a second surface of said external panel; and a connecting central portion disposed between and in overlapping relation to both the first and second flanges.

Abstract: Apparatus for shading a user's neck. In some embodiments, a support device comprises a flexible, generally U-shaped structure with a laterally extending central portion to accommodate attachment of a proximal edge of a neckpiece, and opposing leg portions which extend from the central portion to engage the headwear. In further embodiments, the neckpiece preferably comprises a layer of flexible material with a proximal end supported adjacent a headwear and an opposing distal end configured to be suspended adjacent to a base of the user's neck. A support portion is formed from laterally extending first and second panels which fold together to form a V-shaped channel circumferentially extending in contact against an outermost rearward surface of the headwear. A flap portion extending from the second panel is moveable between a deployed state to cover the user's neck to a retracted state in which the flap portion is gathered into the channel.