The oil lubricated rotary vane vacuum pumps feature enhanced lubrication to facilitate the intake of water vapor. To avoid condensation, each pump is equipped with a gas ballast system. In addition, a WR pump version has been developed to fully take advantage of this system for applications requiring increased water vapor tolerance. The oil lubricated pumps feature lower sound output than competitors and improved ultimate pressure. Designed with the end-user in mind, they also feature continuous duty and simplified maintenance, truly taking efficiency to the next level.