Gas Mask and Respirator Wiki
Gas Mask and Respirator Wiki
Worker-128.png Hold up! Under construction
This article or section is currently under construction and is in an unfinished state. If there is an urgent need for information about this topic, comment at the bottom of this page with a question.

The Soviet O-11 (Russian: Образец-11 — "Model-11") mask was a candidate mask to replace the O-8 as the Red Army's standard-issue gas mask in 1941.


The design featured two circular eyepieces in metal assemblies and a Tissot tube system. Unlike the predecessor, the tube was split in two, and unlike the postwar successor, the tubes weren't integrated into the mask. The valves housing is made out of metal painted gray and, unlike the Mod O-8, has a 40mm GOST thread, which is slightly angled to the housing axis.

Despite a strong similarity to its competitor, the newly-designed ShM-1, the O-11 featured an adjustable 6-point head harness of a unique design as well. This head harness was adjustable only by two pull-tabs on the lower straps, but because of the straps being interconnected in a fashion similar to the GP-4 mask, the entire head harness was effectively tightened at once.


The O-11 used the BS MT-4 and maybe BN MT-4 kit. They contained:

BS MT-4 kit

  • O-11 facepiece
  • M1940/1941 carrier
  • MT-4 filter
  • 40mm stockinette or rubber GOST hose
  • NP anti-fogging inserts

BN MT-4 kit

  • 0-11 facepiece
  • M1936 carrier
  • MT-4 filter
  • 40mm stockinette or rubber GOST hose
  • NP anti-fogging inserts or anti-fogging stick
  • TD-1/IPP-3 decontamination kit
  • Gas cape

External information[]

While the mask's head harness was seen to be a notable improvement compared to the ShM-1's skullcap comfort-wise, the additional troop training required for effective use of the O-11, and the increased manufacturing costs of the harness led to the O-11 design being mothballed, with only 1 production run completed. Thanks to Battlefield archaeology though, there is a wealth of evidence that O-11 examples were pushed into issue during the Siege of Stalingrad.

In 2012, a manual for the ShM-1 and O-11 was found in Russia. This document detailed the designation of the mask, which was unknown at the time. In 2014 a crate of 20 O-11s with MT-4 filters were found. In regards to rarity, between the low initial manufacture numbers and the destruction of many facepieces in the Second World War field use, examples of the mask in non-relic condition were practically non-existent until the 21st century. Even now, very few examples have been found, with some estimates citing figures as low as 20. However there are possibly more masks still in crates.