Series 500 are built for service in critical manufacturing environments that require vacuum and/or internal pressure operation. The mixers are built with either single or double mechanical seals. Double seals are supplied for either conventional lubricated operation or dry running operation for sensitive applications, such as in the pharmaceutical industry. The series 500 model is available in sizes from 1.5 hp-100 hp. All wetted surfaces, except the shaft support bushing, are made of type 316 stainless steel. The bushing is normally supplied in bronze or Teflon, however several additional materials are available to meet each process requirement. Special bushing lubrication systems supply continuous lubrication to the bushing location. All stator heads are available for use with this model.