MER Series from Magnatex Pumps has a stationary shaft.

To safely transfer toxic, corrosive or expensive liquids, MER Series incorporates a magnetic, sealless drive design that prevents process fluids from leaking to the outside environment. FromMagnatex Pumps Inc., the pump has an integral impeller/inner magnet and stationary shaft. It can be used to transfer mineral and organic acids, bases, alcohols, hydrocarbons and halogens.