The MZC rotary airlocks have proven themselves to be very successful in sanitary applications (Dairy execution) as well as many other applications. The unit has an easy detachable rotor which can be removed within a few minutes to facilitate inspection and cleaning. The configuration with direct drive has a very narrow construction, especially in the blow through (BL) version where the conveying line passes underneath the drive. The direct drive, in conjunction with a frequency inverter, results in a very flexible, safe and maintenance free unit (no chains or grease).