[High-quality valve] The screw-in valve is made of high-quality, high-density PP plastic. It is durable, resistant to seawater corrosion, leak-proof, and has a long service life. It is an ideal choice for your kayak, canoe, or inflatable boat. [Leak-proof design] The replacement kayak hardware screws are designed to prevent air leakage. There is a rubber cushion under the air cap. When inflated, the rubber pad under the 20mm screw of the air valve automatically fits the edge of the air cap, helping to prevent air leakage and providing safer performance. [Fast Inflation and Deflation] The screw air valve for inflatable boats can be installed on the piston hole of about 20mm, which allows for quicker inflation and deflation, saving time. [WIDE APPLICATIONS] Suitable for most kayaks, inflatable boats, rafts, rubber boats, and similar inflatable watercraft. [Suggestion] The diameter of the threaded part of the screw-in valve is approximately 20mm. Before purchasing, please check the size of your inflation port to ensure compatibility.