Grundfos 98564937 DLC.208/230.B.1 Duplex Level Controller. This SLC (Simplex Level Controller) features a fiberglass enclosure, stainless steel hardware and an enclosure lock for added security. This Enclosure is ideal for sump, sewage and water applications. This Grundfos 98564937 DLC.208/230.B.1 Duplex Level Controller is a float switch activated, multifunction liquid level controller. This SLC also comes equipped with multiple floats, a time meter, alarm test push button, and a toggle switches mounting plate. The controller may be supplied with an optional float switch-level transmitter assembly designed to the specific tank dimensions. The standard level transmitter is suitable for use with class-II flammable liquids or water.