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Discover the evolution of two-stage rotary vane vacuum pumps. Built to last. Born to perform. And designed to simplify your work. Meet the robust vacuum pump series - CRVpro. There are nine models of CRVpro available with free air displacement from 1.8 cfm to 52.5 cfm. Depending on model, motor options include 1 Ph TEFC, 3 Ph TEFC, and 1 Ph ex proof motors. Welch vacuum pump oil is specifically formulated for the unique needs of vacuum pumps. Always use Welch premium or Welch gold oil.