The 3M Speedglas Breathing Tube Cover SG-15, can be used to help protect the SG-30W and SG-40W breathing tubes from spark and spatter.Extend the service life of your breathing tube with 3M Breathing Tube Covers. Our flame-retardant breathing tube cover protects your breathing tube from molten metal, sparks and splatter. It can be used as a protective cover for the 3M Breathing Tubes for 3M Adflo Powered Air Respirator.