Sutong China Tires Resources TU4009 HI-RUN Heavy Duty Lawn and Garden Tube, 18/850-8 Tr6-Inch
18/850/950-8-Inch, Tr6 Valve Stem, Lawn and Garden Tube, Fits 18x8.50/9.50-8, 18.5x8.50-8, 18.5x9.50-8, 20x8.00-8 and 20x10.00-8.