The 3M™ Speedglas™ Breathing Tube is a replacement breathing tube for Adflo 3M™ Powered Air Purifying Respirator when used with the 3M™ Speedglas™ Welding Helmet 9100-MP, 3M™ Speedglas™ Welding Helmet 9100 FX-Air or 3M™ Speedglas™ Welding Helmet 9100-Air .The breathing tube helps connect the welding helmet to the turbo unit.