Abstract: A device which helps secure the gas supply lines which deliver a supply of a specialized gas, such as oxygen, to a cannula. The device is a holding structure which includes a cannula tubing retainer attached to a clamping device. The cannula tubing retainer is positioned relative to the clamping device so that a centerline running along an upper surface of said tubing retainer is approximately parallel, if not parallel to a centerline which runs through a clamping mechanism of the clamping device. The clamping device is actuated by a lever with an over center cam action that forces the jaws of the clamp together, and the lever locks the clamp in place when the lever is in a closed position. When the cannula wearer is walking, the clamping device is typically clamped to an article of clothing.