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As a professional high quality Fuel Injector Spacer manufacture, you can rest assured to buy it from our factory and we will offer you the best after-sale service and timely delivery.A fuel injector spacer, also known as an insulator or fuel injector spacer ring, is a small component used in some fuel injection systems to improve the performance and efficiency of the engine. It is typically a gasket-like or ring-shaped part made from insulating material such as plastic or phenolic resin.