New reproduction Gasschutzmaske 1915 ring for attaching the filter to the mask. These are the metal rings that were fitted to the mask to accept the filter. Ring measures approximately 4" in diameter and features a large thread attachment point where the male end of the filter would screw into.These are excellent reproductions for mask restoration projects or as kit filler for display. These will work with our reproduction M15 filters available separately. Please note, these are reproductions and are intended for display purposes only. They do not provide any protection against smoke or poisonous gas. Colors of rings may vary from photos.