Kirby-Morgan makes a unique configuration of full-face mask, the KM-48 Supermask, which has some characteristics of a half mask, while retaining many of the advantages of the full face mask: The rigid plastic main frame of the mask has a rubber skirt which seals around the eyes and nose like a standard half-mask, the nose may be pinched through the rubber nose pocket to equalize in the same way as with a half mask, and there is an extension to the skirt which seals around the lower part of the face and encloses the mouth. This mask has a clip-on pod section which carries the demand valve, and this part seals against the lower part of the frame, allowing the diver to remove the regulator pod when on the surface, or to use an alternative gas supply, which can either be mounted on another pod, or be an ordinary Scuba regulator second stage with a standard mouthpiece. This feature makes it possible to use bailout gas supplied by a dive buddy with a standard regulator while wearing a Supermask. An optional pod with a dive/surface valve for use with rebreathers is available to military users.