Standard Model:
This configuration is suited for applications such as pneumatic conveying, wastewater treatment, and general process industries requiring high-pressure, high-volume air. Seal areas are vented to atmosphere to relieve process pressure from the internal lip seals and to ensure delivery of oil-free air.

Single Envelope Gas Service:
This series is designed for applications including closed-loop pneumatic conveying, process gas handling, and elevated-pressure service up to 100 PSIG discharge. Vent openings are tapped and plugged to prevent gas leakage and may also be configured to accept an inert gas purge for positive containment of the process gas.

Double Envelope Gas Service:
Built to laboratory-grade standards, this series is intended for applications requiring near-total sealing. In addition to the features of the Single Envelope Gas Service configuration, the drive shaft is mechanically sealed and oil sumps are plugged, providing an enhanced level of leakage protection.