In a residential basement, a sump looks like a large, cylindrical plastic or fiberglass basin—usually two feet wide and deep—embedded flush into the concrete floor, with its top open and covered by a flat lid. Inside the basin sits a submersible electric pump attached to a vertical discharge pipe and float switch. In an automotive context, an engine oil sump looks like a contoured stamped-steel or cast-aluminum pan bolted to the bottom of the engine block, featuring a threaded drain plug at its lowest point.
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