Three kinds of valve stem extension（45 degree, 90 degree and 135 degree）successfully solved a series of operations such as inability to pump or check air pressure due to insufficient space between the valve and the spokes, or the inconvenient position and angle of the valve. Due to the built-in valve core, they can allow inflation and deflation, which is convenient and quick. Be sure to tighten the thread when using it, otherwise the best sealing effect cannot be achieved.The tire valve extension joint is made of brass, the surface is chrome-plated, the chrome-plated layer has higher hardness, better heat resistance, and is not easy to rust. Equipped with rubber sealing ring and sealing cover, durable. The bottom of the extension piece rotates freely, which is easy to operate, convenient and efficient.Prevent air leakage! 1. Install the valve angle extension on the valve core, and be sure to tighten the thread of the rotating part so that there is no air leakage. 2. When you are adjusting the angle, you rotate the valve extension. After the angle adjustment is over, you must tighten the rotating thread to the maximum. 3. The threaded head on the valve extenders is screwed on the existing valve stem, and the included end cap replaces the existing valve stem cover.Our valve core adapters are equipped with rubber sealing rings and sealing caps to ensure air tightness without leakage. It is recommended to tighten the sealing caps quickly after use to prevent air leakage！These tire valve extensions suitable for most bicycles, motorcycles, strollers, trailers, RVs with standard American tire valves.How long is the warranty/renew? We offer a hassle-free 12-month warranty and 24-hour friendly customer service. If there is any dissatisfaction with the product, or the parts are missing, please contact us at any time, whether it is a new one or a refund, we will definitely give you a satisfactory answer. Be responsible for your choice, let you place an order with peace of mind~ Product Specification Angles: 2 X 45 degree, 2 X 90 degree, 2 X 135 degree. 45 degree: The long side is 1.4inch/3.5cm, The short side is 1inch/2.5cm. 90 degree: The long side is 1.4inch/3.5cm, The short side is 1inch/2.5cm. 135 degree: The long side is 1.6inch/4cm, The short side is 0.9inch/2.2cm. Warning Before driving, it is recommended to remove the schrader valve extension from the tire. The design of the stem extension is not suitable for wheels in high-speed operation. High-speed rotation and vibration may cause loosening and air leakage risks. For your safety and user experience considerations, be sure to tighten the threads on the valve core, and the cap on the valve core also needs to be tightened before it can exert its airtight effect.