The HSD.55S is a lightweight and robust single-phase submersible drainage pump with an agitator and impeller constructed from chromium iron to reduce clogging and increase wear resistance when pumping particulate-contaminated water sludge and bentonite. The hydraulic design of this pump features a double mechanical seal with an oil lifter for positive seal lubrication in any operating position not only that but the high-performance motor enables long periods of operation while partially submerged. Supplied with a pendant float switch for automatic operation. Built for use and designed for long life application.