[APPLICABLE SIZE] The size of the one-way check valve is 8mm, the size of the clamp is 10mm, and the size can be adjusted. Please make sure the size of this product is the one you need before purchasing. [ONE-WAY CHECK VALVE] The basic design of this product can prevent backflow in the pipeline. This product can perfectly solve your vehicle's hard or slow starting problem. The arrow marked on the valve indicates the direction of fluid flow, preventing fuel from returning to the tank and keeping it in the line. [DURABLE MATERIAL] The one-way check valve is made of high quality aluminum alloy and the mold is sophisticated. The service life of the aluminum head is longer than that of the plastic head and is more reliable. Strong threaded joints, non-slip design, can be used with hose clamps to ensure that the pipe will not fall off. [EASY TO INSTALL] The aluminum carburetor check valve is very easy to install and replace. An arrow on the check valve indicates the direction of fluid flow. You just need to install it correctly in the direction shown. [WIDE USE] The one-way check valve can be widely used in fuel systems such as standard cars, Renault cars, motorcycles, ships, helicopters, etc. The one-way check valve is also suitable for non-self-priming hydraulic pumps and kitchen pumps.