U.S. MARK III[]
The US Navy MK III diaphragm was made and replaced the U.S. Navy Mk II, and would pave the way for the US MARK IV.
Overview[]
Lenses - The lenses resemble an oval shape, with a metal rim encasing the outside of the lenses. Because of the size, the field of view is reduced. The lenses were made out of plastic.
Hoses - The hoses are made out of rubber, and connect to the facepiece by a small rubber tube that leads to the lenses. Tape keeps the hose connected to the mask and filter. The colour on the tape masks can vary, but mostly is the colour blue.
Voicemitter - The voicemitter is standard with all double hose masks, a metal disc with 6 holes pressed into the metal with a plastic disc inside of it and the exhale valve connected to the bottom. The mask uses an oral cone to redirect the user's voice to the voicemitter, making speech easier for the wearer of the mask. The exhale valve is a MVI ”spearhead“ valve.
Filter - The filter on this mask is also standard-issue with ALMOST every double hose mask. An example of a mask not having a B2 type filter is this MI-I-5 Army Optical Mask. The filter sits on the back of the neck, where a metal clip connects the leather headharness with the filter.
Markings - The manufacturer’s stamp and date sit on the chin of the mask.
Carrier[]
The issued carrier is the M5 carrier. It is made out of canvas with a shoulder strap stitched into the top of both sides. There 3 flaps. 2 smaller ones and 1 big one. The smaller flaps (Sides) would be flapped inwards towards the bag, and then the main flap (top) would be flapped towards the front of the bad where 2 ”push-click” buttons would be used.
Variants[]
Diver Variant[]
Rebreather with the same facepiece.
Supplied Air Variant[]

US ND Mk.III Facepiece in the Industrial Supplied Air Respirator Configuration with dual Class B Grey Rubber Hoses
Industrial Variant with the same facepiece