The McCulloch Medical™ Oxygen Recovery Masks facilitate post-surgery, post-trauma and post smoke-inhalation patient recovery. Masks feature a rubber-mounted 22mm oxygen adaptor fitted to a durable polycarbonate mask with dual vents, not valves, to ensure unrestricted inhalation and prevent unforeseen reduction or increase in O2 flow. Mask bodies are manufactured from durable polycarbonate. Diaphragms are manufactured from tear-resistant thermoplastic material. 6 ft oxygen tubing. Used by fire departments in 50 US states & other countries. Clean in 1:20 solution of bleach and water. Optional hook and strap sets available to secure the McCulloch Medical™ Masks. All masks carry the McCulloch Medical™ 2-year replacement warranty.