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2 Boston Valves: These are 2 different thread patterns commonly found on the base of Boston Valves. This package contains 2 Boston Valves, each with a different thread pattern. One of them will fit your inflatable. The Other will not. Be sure to save the spare for other inflatables that may use this thread.
To inflate with a low-pressure high-volume pump:
The Boston valve is designed to be inflated with an electric or manual low pressure high-volume pump. Unscrew the cap to expose the Boston Valve underneath. Hold the proper fitting to the top of the Boston Valve and inflate. Remove the pump fitting and replace the Boston Valve Cap
1: Diameter: 20mm
thread length: 20mm
2: Diameter: 24mm
thread length: 16mm