[High Quality Boston Valve]: Inflation spiral valve is made of high quality and high density ABS plastic. It is durable and has the characteristics of anti-seawater corrosion, anti-leakage and long service life. It is a good alternative to your inflatable kayak canoe inflatable boat. [Waterproof Design]: The kayak hardware replacement screw is designed to prevent air leaks. There is a rubber pad at the bottom of the air cap. After inflation, the rubber pad at the bottom of the 20mm screw air valve will automatically fit the edge of the air plug, which can prevent leakage more effectively and give you more secure protection.[Rapid inflation and deflation]: Inflatable boat inflation spiral valves can be installed in the piston hole about 20mm / 0.78in inch, which to speed up inflation and deflation, save your time. [Widely Used]: Boston Valve Universal Valve replacement fits most kayaks, inflatable boats, rafts, rubber boats, etc.