US UK DE IT ES Size thread part diameter is about 0.78 inch, thread part length is about 0.62 inch Style A, Style B are the same size, please check the size of the inflatable boat valve before purchasing FR Applicable for standard Boston valve replacement set fits for most kayaks, inflatable boats, rafts, dinghies, etc. Not universal, please measure the size of the inflatable boat valve beforeUS Note please measure the size of the inflatable boat valve before purchase Style A, Style B is the same size, this kit style B is style A without the gasket, 8 pcs 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 pcs are both the same sizeFR Size thread part diameter is about 0.78 inch, thread part length is about 0.62 inch. Please check the size of the inflatable boat valve before purchasing US UK DE IT ES Applicable to standard Boston valve replacement set fits for most kayaks, inflatable boats, rafts, dinghies, etc. Not universal, please measure the size of the inflatable boat valve beforeMaterial The boston valves replacement is made of quality dense ABS plastic, sturdy, corrosion resistant and durableManufactured constructions the large design with a valve cap ensures leakproof inflation, twoway air valve, which is easier for you to inflate quickly