About this itemcolorblack[High-quality Boston valve]: Air valve inflatable boat spiral is made of high-quality and high-density ABS plastic. airbed replacement valve is durable and has the characteristics of anti-seawater corrosion, anti-leakage and long service life. 20mm screw air valve is a good alternative to your inflatable boat.[Leakproof design]: The inflatable air valve replacement screw is designed to be closed. There is a rubber pad at the bottom of the air plug. 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 provide you with Safer protection.[Quick inflation and deflation]: Inflatable boat spiral air plugs can be installed in the piston hole of about 20mm, which can quickly inflate and deflate,saving you time.[20mm Size]: The diameter of the threaded part of the Boston screw valve is about 20mm. Please pay attention to the size before buying, not all of our nozzles are suitable for all air cushions and inflatable boats, and are not suitable for special sizes, such as mesh boats.[Widely used]: The standard Boston valve replacement is suitable for most kayaks, inflatable boats, rafts, rubber boats, etc.package 4pcs Air valve inflatable boat spiral