2 pcs 8mm Check Valve, Aluminum Fuel Check Valve, One-Way Check Valve, Fuel Control Valve with 4 Clamps [Applicable Size] The size of the one-way check valve is 8mm, the size of the clamp is 10mm, and the size is adjustable. Please ensure that the size of this product matches the size you need before purchasing./ 【One-Way Check Valve】 The basic design of this product prevents backflow in the pipe. This product can perfectly solve the problem of difficult or slow starting of your vehicle. The arrows marked on the valves indicate the direction of fluid flow, preventing fuel from returning to the tank and keeping it in the pipes./ 【Durable Material】 The one-way check valve is made of high-quality aluminum alloy, the shape is precise, and the aluminum head has a longer lifespan than the plastic head and is more reliable. Strong threaded joint, non-slip design, can be used with a collar to ensure that the pipe does not fall off./ [Easy to Install] The aluminum carburetor check valve is very easy to install and replace. The arrow on the check valve indicates the direction of fluid flow. All you need to do is install it correctly in the specified directions./ 【Wide Range of Applications】 The one-way check valve can be widely used in fuel systems for cars, motorcycles, boats, helicopters, etc. One-way check valves are also suitable for non-self-priming hydraulic pumps and kitchen pumps.