The 50WQD10-10-0.75 is a model number for a heavy-duty, breaks down into its primary technical specifications:50: The discharge outlet diameter size, which is 50 mm (2 inches).WQ(D): The pump series code, where WQ stands for a submersible sewage pump and D denotes a single-phase (220V–240V) motor configuration.10: The rated volumetric flow rate, which is 10 m3/h (approximately 166