The 3M 6800DIN Full Face Piece with Din Conn is a 6000 series full facepiece with a single DIN thread port on the front of the facepiece. It is NIOSH approved for use with the 3M Cartridge FR-C2A1 or 3M Cartridge FR-64 for acid gases (including chlorine), CN, CS, and particulates (P100 filter). The FR-C2A1 cartridge meets military specifications MIL-C-51560 and EA-C-1704.