Boston valve in 4 pieces, universal one-way valve for inflatable boats, rafts, swimming pools and air mattresses.

Material: The Boston inflation valve is made of high-quality ABS, a robust, durable, corrosion-resistant, and leak-proof material. Dimensions: The bottom thread diameter is 22 mm (outer) and 20 mm (inner). The exact dimensions of the Boston valve are shown in the second image. Please check the dimensions to ensure compatibility with your valve cap before purchasing. Use: Ideal for standard Boston valve replacement kits and most boats, rafts, pools, inflatable boats, air mattresses, etc. This one-way valve allows for rapid inflation. The leak-proof cap design ensures leak-free inflation.