Measure the depth of the threaded hole on your mask from the base to the gasket. If it is deeper than 1/2", please contact us for gasket shims.

• Adapts gas masks and respirators with 40mm NATO threading such as SGE 150/400 to accept 3M filters.
  

• 2-piece design allows for the filter to be able to be set in different positions so that the rectangular, non-round 3M filters can be used as well

• Includes gasket kit