The US diaphragm mask was improved by making the eye lenses replaceable and making a one-size-fits-a
The US diaphragm mask was improved by making the eye lenses replaceable and making a one-size-fits-all mask (called a Universal mask). This mask was known as the ND Mark II (Army: MII diaphragm gas mask). A mask with an unmistakable appearance, it continued to use the basic stockinette-coated rubber sheeting for the facepiece, but it had an ungainly appearing diaphragm. The diaphragm was large, but recessed, and the inlet air tubes were externally mounted to protect the diaphragm and the outlet flutter valve. The outlet flutter valve was mounted directly in front of the diaphragm and pointed up. This mask, while an improvement, still had problems: exhaling was difficult when facing high winds, the long hose could catch on ship equipment, it was bulky, and vision was still restricted. Research continued to create a new mask, preferably a technologically advanced one with a molded facepiece. -- source link
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