A mounting and coupling assembly for a mixer for in a container having an impeller connected to a drive shaft, in an assembly, which extends through an opening into the container. The assembly includes a lip mount to stabilize and support the mixer on the lip of said container. A cover secures said lip mount with threaded fasteners engaging complementary fasteners on the container neck and clamping the plate to the container lip. A primary objective of the invention is to allow the stable mounting of a mixing unit to bulk containers and allow easy and safe coupling of a power module to the mixing assembly.