Abstract: A protective cover for automobile deep dish wheel rims is disk shaped and includes an annular groove protruding outwards from a back surface. A plurality of rubber gripping pads are included along the outward-facing surface of the annular groove for enhancing attachment of the cover to a wheel rim. A semi-circular groove in the annular groove is sized to accommodate the valve stem of the automobile tire. Handles protruding from a front surface of the cover enable gripping the protective cover when attaching and detaching the cover to a wheel rim. One or more annular shoulders on the disk shaped body of the cover to enhance rigidity of the cover. In a second preferred embodiment, the annular groove is fitted along its outer surface with a weather strip rather than rubber gripping pads.

Abstract: A breathing apparatus provides circulated air within a hood surrounding a user's head and utilizes active scrubbing to remove carbon dioxide from the air in the hood. The breathing apparatus includes a heat sink that provides cooling to the circulated air. A method for cooling air circulated within a breathing apparatus includes operating an air pump to circulate the air so that the air comes into contact with a heat sink to which the air releases heat. In an embodiment, a compressed oxygen gas cylinder releasing the compressed oxygen acts both as a driver for a Venturi device that operates as an air pump and as a heat sink.