It lasts longer and is more durable than plastic. ☺【Ideal aAccessory sSelection】: Prevent fuel from flowing back into the fuel tank and keep it in the pipeline, which perfectly solves the problem of difficult or slow vehicle startup due to fuel flowing back through the pipeline. ☺【Easy to Use & Install】: The kit includes 2 8mm fuel check valves and 4 fuel hose spring clips. Valve Bodies 8mm Aluminum Fuel Non-Return One Way ... - Grandado KVAEY 2 PCS One Way Check Valve, 5/16" 8mm Aluminium Alloy Non Return One Way Check Valve with Clamps, Fuel Hose Control Valves for Petrol Diesel Oil Water, Car Accessories The use of aluminum check valves can effectively solve the problem that the vehicle is difficult to start or starts slowly due to the backflow of fuel through the pipeline. The fuel check valve is robust and durable for long-term use. You just need to install it correctly in the specified direction. ☺【Professional Fuel Check Valve】: Suitable for automatic oiler and low pressure fuel system, gasoline or diesel one-way fuel valve. Installation and replacement of aluminum check valves for automotive carburetors is very easy. 6mm 8mm 10mm 12mm Inline One-way Non-return Check ... – Vicedeal Diesel check valves have an arrow indicating the direction of fluid flow. Windscreen Washer Pipe Lezed Aluminium Fuel Non Return One Way 2pcs Check Valve