JOYAM Two Stage Water-Ring Pumps are better design then Single Stage Vacuum Pumps, having advantage of higher capacity at high vacuum and also required low quantity of water at low pressure. It's design based on a latest technology and save energy. Two Stage Vacuum Pump develops maximum vacuum of 720 mm Hg, when sealing water temperature is 30C ( 755 mm Hg barometric Pr.& suction temperature of 30C ) and achieves vacuum up to 735 mm of Hg, when sealing water temperature is 15C to 18C. Due to its latest technology and design, it so happen that a smaller model may require as compare to Single-Stage Vacuum Pump.