Tengyu magnetic pumps are in compliance with API 685. They are seal-less. The driving torque is transmitted by the drive magnet to an internal magnet assy that moves the impeller. There are Close-coupled Mag Drive pumps with a Heating or cooling chamber option. Closed impeller, Semi-open impeller, and open impeller of stainless steel magnetic drive pumps are available for different applications. Tengyu Magnetic drive pumps key feature is" less maintenance". We have been in this market since 1986. Please contact us for any complex application.