PRODUCT DESCRIPTION CDU800 is a Submersible Cast Iron and Coated Steel Sump Pump with Vertical Float Switch. For use in 11" diameter or larger sump basins; 9" ON level and 4" OFF level. Intended for indoor use only. AMAZON.COM The Wayne 1/2 HP cast iron submersible sump pump is designed for work in sump pits 11 inches or larger. Its ceramic mechanical seal keeps this pump going in even the most demanding environments, and the 1 1/2-inch discharges creates maximum flow and ensures easy installation. It works 9 inches on level or 4 inches off level. A two-pole switch prevents basement flooding in the event that one pole sticks, and disconnecting 115-volt conductors prevent damage from lightning. The automatic overload mechanism prevents damage to motor windings, permanently lubricated ball bearings need no oiling, and the waterproof three-prong grounding wire with an 8-foot extension reaches distant outlets. Wayne backs its pump with a three-year limited warranty. FROM THE MANUFACTURER Is that noisy sump pump keeping basement dwellers up all night? Equipped with cast iron housing for long life and quiet operation, the Wayne CDU800 sump pump keeps the basement dry and the sleepers asleep. This compact, submersible pump is designed for sump pits 11 inches and up, either 9 inches on level or 4 inches off. Its ceramic mechanical seal assures long life in the most demanding applications. And, its 1- 1/2-inch discharge allows easy installation and ensures maximum flow. A two-pole switch keeps the basement from flooding should one pole stick. And, for added reliability, disconnecting 115-volt conductors prevent lightening damage. The device operates vertically to save space, which makes more room in the basement for boxes, skis, bikes and tools. More great features: an automatic overload mechanism prevents damage to motor windings; permanently lubricated ball bearings require no oiling; a waterproof 3-prong grounding wire with an 8-foot extension reaches distant outlets. A liquid lubricated, ceramic seal prevents water from entering motor housing for years of dependable use and quiet, cool operation. Wayne includes a 3-year warranty.Intended for indoor use only. Intended for Indoor Use Only. See more