Excellent ultimate vacuum and pumping speed by suing high performance new materials. MPV 90 series include Improved oil anti-subpack system to protect the vacuum system in the event of sudden stop. MPV 90 Occupy international standard clamp and flange at inlet and outlet port and perform at very ow noise and vibration. Occupying strong and constant pressured oil circulating system to protect the pump. MVP 90 require very simple maintenance and oil replacement with no special tools.