Three kinds of valve stem extensions—45 degree, 90 degree, and 135 degree—help solve issues such as difficulty inflating or checking air pressure due to limited space between the valve and spokes, or inconvenient valve position and angle. Featuring built-in valve cores, they allow for easy inflation and deflation. Always tighten the threads during use to ensure optimal sealing performance. The tire valve extension is made of brass with a chrome-plated surface. The chrome plating offers increased hardness, improved heat resistance, and enhanced corrosion resistance. Equipped with a rubber sealing ring and sealing cap, it ensures durability. The base of the extension rotates freely, allowing for easy operation and improved efficiency. To prevent air leakage: 1. Install the valve angle extension onto the valve core and securely tighten the rotating part’s thread to avoid leaks. 2. When adjusting the angle, rotate the valve extension. After adjustment, fully tighten the rotating thread. 3. Screw the threaded end of the extender onto the existing valve stem, and replace the original valve cap with the included end cap. Valve core adapters include rubber sealing rings and sealing caps to ensure airtight performance. It is recommended to securely fasten the sealing cap after each use to prevent air loss. These tire valve extensions are compatible with most bicycles, motorcycles, strollers, trailers, and RVs equipped with standard American-style tire valves. We offer a hassle-free 12-month warranty and 24-hour customer support. If you experience any issues with the product or find missing parts, please . We are committed to providing a satisfactory resolution.