KM-15 (ShL-50) This simple continuous flow type mask features a black rubber face-cup with a small diameter inlet hose and two holes in the face-cup for exhaling air (no rebreather bag attached). KM-15I (ShL-50) An upgraded and improved KM-15 mask featuring a single hole in the black rubber face-cup for exhaled air and a latex rebreathing bag attached to its lower aspect. A small glass tube is fitted inline on the oxygen delivery hose to catch condensation. Both the KM-15 and KM-15i use a rubber head-strap retention system; they are not attached directly to the helmet (such as with studs, hooks, or bayonets).
