Trans American 4.80/4.00-8 Inner Tube with TR13 Straight Valve Stem TR13 straight valve stem fits most applications. Quality 4.80/4.00-8 inner tube. Perfect for use in trailer, lawn/garden and utility applications. ISO 9001 manufactured. NSN 2610014522934 For use in tadial and bias tires (4.80R8 and 4.00R8).