Overview Reviews Product Description Tire valves were invented by August Schrader and his son George, and they patented the design in 1898.Tire valves are standardized around the world and all are basically this same design, which hasn't changed in over 100 years.The male thread dimension is 0.305" O.D. x 32 threads per inch. Greenline Industrial Fitting Catalog New Greenline Industrial Fitting Catalog Product Videos Custom Field Product Reviews Write a Review Write a Review × Greenline 1/4" Brass Hose Barb - Schrader Valve G21TVB-030-025 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *