Preferred Compounding Corp

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Founded in 1952 as a division of the Albert Trostel & Sons Company, Trostel Ltd. is an international designer and manufacturer of custom rubber compounds, seals and precision molded products. The company offers a wide range of seals, such as dynamic, cartridge, grease, vacuum, unitized, reciprocating and oil seals. In addition, it provides impellers, integral seal assemblies, custom shapes and valve seats. The company serves industries, including automotive, industrial, marine, military, oil and gas, plumbing and passenger car. Trostel Ltd. is a member of the Everett Smith Group, Dickten Mash Plastics, Maysteel, Eagle Ottawa and OEM Worldwide Inc. It is located in Lake Geneva, Wis.