Boston valve replacement made of high quality ABS plastic, durable, corrosion resistant The standard Boston valve replacement kit is suitable for most kayaks, inflatable boats, rafts, rubber dinghies, etc. The diameter of the threaded portion is approximately 0.78 "and the length of the threaded portion is approximately 0.65" With valve cover to ensure against leakage. The valve is one-way air charging valve, which is conducive to rapid inflation