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 Goulds Pumps feature the SD series Sink Drain Pumps.  These systems are a fully assembled package designed for wet bars, laundry trays, air conditioning condensate, dehumidifier condensate, residential dishwashers and beautician sinks. The pump is built into the basin which has a built-in threaded inlet, vent and discharge connections. Each package unit also includes 1-1/2" schedule 40 PVC internal piping. The basins for both units are 10 gallon structural foam basins with 1-1/2" NPT threaded vent, discharge and inlet connections. The main difference is the accompanying pump: the SDS-ST unit includes a ST31AV pump with a built-in vertical master float switch, while the SDS1 unit includes the EP4011 pump with a A2H11 vertical level switch with a piggyback plug. The pump have different performance ratings and can handle distinct diameter solids - please see the chart below. GOULDS SD SERIES SINK DRAIN PUMP SYSTEM Model Comparison Chart Model Pump Discharge HP Voltage Phase GPM Max. Head Cord Solids SDS-ST ST31AV 1-1/2" 1/3 115 1 50 26' 10' NEMA 3-Prong 1/2" SDS1 EP0411 1-1/2" 0.4 115 1 55 24' 10' 3/4" PERFORMANCE CURVE SDS-ST PERFORMANCE RATING AND DIMENSIONS SDS1 PERFORMANCE RATING AND DIMENSIONS SDS-ST BROCHURE Goulds SDS-ST Sink Drain Pump System Brochure SDS1 BROCHURE Goulds SDS1 Sink Drain Pump System Brochure Pump Products application engineers are standing by to help you find the right pump, as well as to provide price quotes, stocking availability and shipping information. Call our toll free number 1-800-429-0800 to speak to an expert today.