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Wayne's CDU800 features a durable cast iron base and epoxy-coated housing for long life and quiet operation. This submersible pump is designed for small sump pits, as small as 11 inch, the CDU series is one of the most popular replacement sump pumps in America. The ceramic mechanical seal assures long life in the most demanding applications and the 1-1/2 inch discharge allows easy installation. This powerful 1/2 HP sump, pumps up to 4200 GPH.