Replacement breathing tubes for 3M™ Speedglas™ Supplied Air System and 3M™ Adflo™ Powered Air Respirator.Replacement breathing tubes for 3M™ Speedglas™ Supplied Air System and 3M™ Adflo™ Powered Air Respirator. Connects welding helmet to turbo unit or supplied air unit. Increase the service life of your equipment by checking it regularly.