A pumping system (10; 100) featuring a mounting base (40; 140) having a circular portion (42) with a circumferential wall (42a', 42a") configured with at least two slots (42b) formed therein; a motor, pump and electronics assembly (50) having a housing (54, 56) with a motor (58)arranged therein, the housing (54, 56) being configured with at least two detents (54a) formed thereon; and a switching assembly (60) having a water level sensor (62a) configured to respond to a water level and turn the motor (58) on and off, the switching assembly (60) being arranged in the housing (54, 56) of the motor, pump and electronics assembly (50). The mounting base (40; 140) and the motor, pump and electronics assembly (60) are coupled together using a detent and slot arrangement so that the at least two slots (42b) receive the at least two detents (54a) for rotationally coupling together the mounting base (40; 140) and the motor, pump and electronics assembly (60) in at least two rotational orientations that differ by 180°.