Ruef, for short, is headquartered in Nanjing, Jiangsu Province, China. At present, it has three factories in the world, namely Nanjing, Jiangsu Province, China, Rui'an, Zhejiang Province, China and Monterrey, Mexico. Founded in 1982, the company specializes in the production of primary and secondary filters for filtering impurities in fuel system and tail gas treatment system, mini small filters for filtering impurities in fuel injection system, gearbox system, steering system and braking system, as well as other vehicle injection molded parts, check valves, solenoid valves, etc.