A variable speed pumping system comprising: a pumping assembly including at least a pump, a motor, and a drive assembly, said pumping assembly having a mount including a plurality of mount apertures (60A-D) and a center point positioned substantially equidistant from each of said plurality of mount apertures (60A-D), each of said plurality of mount apertures (60A-D) positioned substantially equidistant from adjacent mount apertures (60A-D); and an interface module with a user interface control panel, configured for electrical communication with the drive assembly, for user input of parameters; the interface module comprising a plurality of interface apertures (72A-B) positioned substantially the same distance from a center of the interface module; characterized in that: the interface module is selectively positionable among a plurality of positions with respect to said mount to allow the interface module to be removably installed in any of said plurality of positions on said mount, with the plurality of interface apertures (72A-B) aligned with the plurality of mount apertures (60A-D); wherein said plurality of positions includes a first position, a second position, a third position, and a fourth position, said interface module selectively positionable between said first position, said second position, said third position, and said fourth position on said pumping assembly. a pumping assembly including at least a pump, a motor, and a drive assembly, said pumping assembly having a mount including a plurality of mount apertures (60A-D) and a center point positioned substantially equidistant from each of said plurality of mount apertures (60A-D), each of said plurality of mount apertures (60A-D) positioned substantially equidistant from adjacent mount apertures (60A-D); and an interface module with a user interface control panel, configured for electrical communication with the drive assembly, for user input of parameters; the interface module comprising a plurality of interface apertures (72A-B) positioned substantially the same distance from a center of the interface module; characterized in that: the interface module is selectively positionable among a plurality of positions with respect to said mount to allow the interface module to be removably installed in any of said plurality of positions on said mount, with the plurality of interface apertures (72A-B) aligned with the plurality of mount apertures (60A-D); wherein said plurality of positions includes a first position, a second position, a third position, and a fourth position, said interface module selectively positionable between said first position, said second position, said third position, and said fourth position on said pumping assembly. the interface module is selectively positionable among a plurality of positions with respect to said mount to allow the interface module to be removably installed in any of said plurality of positions on said mount, with the plurality of interface apertures (72A-B) aligned with the plurality of mount apertures (60A-D); wherein said plurality of positions includes a first position, a second position, a third position, and a fourth position, said interface module selectively positionable between said first position, said second position, said third position, and said fourth position on said pumping assembly.