Beeswift – 3M 501 Filter Retainer – 501

3M 5000 Series Filter Retainer (501) The 3M 501 Filter retainer is used to keep the 5911, 5925 and 5935 filters in place at the front of the respirator. Can be used with 3M 5000 Series filters to add particulate protection to the gas and vapour filters.