Usage Tips:US UK DE IT ES Size: the diameter of thread part is approx. 0.78 inch, length of thread part is approx. 0.62 inch; Style A, Style B are the same size, please check before buying the size of the inflatable boat valve FR Apply to: the standard Boston valve replacement set fits for most kayaks, inflatable boat, raft, rubber dinghy, etc.; Not universal, please measure the size of the inflatable boat valve before US Note: please measure the size of the inflatable boat valve before purchase; Style A, Style B are the same size, this kit style B is style A without the gasket, 8 pieces are both the same size UK Note: please measure the size of the inflatable boat valve before purchase, Not applicable to all kayaks; This kit style B is style A without the gasket, 8 pieces are both the same size FR Size: the diameter of thread part is approx. 0.78 inch, length of thread part is approx. 0.62 inch. Please check before buying the size of the inflatable boat valve US UK DE IT ES Apply to: the standard Boston valve replacement set fits for most kayaks, inflatable boat, raft, rubber dinghy, etc.; Not universal, please measure the size of the inflatable boat valve before Material: the boston valves replacement is made of quality dense ABS plastic, sturdy, anti-corrosion and durable Manufactured designs: the great design with a valve cap ensures anti-leak inflation,two way air valve, which is more easier for you to inflate quickly