Emergency Escape Respirators, Ammonia; Methylamine no checkout Headgear with 4" ratchet headband Headgear with 4" ratchet headband features a speed mounting loop that will accommodate welding helmet or faceshield Quick change system designed for safe but the benefits of not having to use gas makes this product extremely popular Operates on DC straight polarity (DCEN) Mouthbit respirators offer a quick and economical method to escape non IDLH emergency situations Large 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)