Does not fit mask shown in ad
The filter shown was advertised as replacement filter for valve mask/respirator.  It did not fit.  Wasted $42.00.  Disappointed and frustrated.  Trying to find a filter that works for the masks I purchased through Amazon a while back.  I can not even find the name "seffer" on any of the masks you offer now.  Frustrating.  Your system does not seem to be set to where a person can rate using a less than star.  I only rated a one star because I was not given the option to rate less.
Rating: 1 stars