a main body sized to enclose at least a portion of a device, said main body extending a distance beyond a port provided on the device, said distance creating an area between the device and said main body to house an air extraction device, said main body defining an opening therein that is substantially aligned with the port provided on the device; and

a cover sized to substantially cover the opening defined by said main body, said cover including a recessed portion that is inset with respect to a non-recessed portion of said cover by a distance that is about equal to the distance by which the main body extends beyond the port provided on the device so that said recessed portion is in close adjacent relationship to the port, the recessed portion defining an opening therein that is substantially aligned with the port, the recessed portion in said cover allowing a user to access the port on the device.