Rubber Master Brand ATV Tire Inner Tube with TR4/6 Threaded Metal Valve - 8 inch Combination Size will fit 18X10-8 18X11-8 19X7-8 20x7-8, 20x10-8, 20x11-8 Designed for outdoor power equipment Go Karts, ATV's Etc. Fits Sizes: 20x7-8 20x10-8 20x11-8 Tube has TR4/6 Threaded Metal Valve Can be used ith both Radial and Bias applications