The transparent shell of the fuel filter is made of plastic, and the top/bottom cover of the filter is made of metal brass, which can absorb metal impurities in gasoline and better protect the engine This in-line fuel filter can be applied to 3/8 inch fuel pipes, used to replace the fuel filter of gasoline engines of automobiles, motorcycles and trucks The fuel filter is easy to use, the transparent shell makes it convenient to observe whether the filter paper needs to be replaced or not, and whether the gas could pass through the filter. Please replace the fuel filter regularly The transparent shell of the fuel filter is made of plastic, and the top/bottom cover of the filter is made of metal brass, which can absorb metal impurities in gasoline and better protect the engine