Emergency Escape Respirators, Ammonia; Methylamine ORS NASCO self igniting system with safety lock self igniting system with safety lock that ensures the switch is not turned on when not in use Built in "refillable" plastic fuel tank spring loaded release mechanism prevents ratchet from opening accidentally soft and flexible nose pads hold securely without pinching Wider nose clip fits a variety of facial types Silicone mouthpiece is more comfortable to wear over long periods Packed in sealable plastic bag (carrying bag sold separately 79BAG) Mouthbit respirators offer a quick and economical method to escape non IDLH emergency situations Large