Liberty Pumps 287 is a 1/2 HP Automatic Submersible Sump Pump with a magnetically operated vertical float VMF switch and 10ft power cord. This pump can operate in a 10" diameter sump pit, a unique one-piece cast iron housing and thermally protected, permanently lubricated motor.Th e Liberty 287 Model is for Sump and De-watering Applications only. This Vertical Magnetic Float (VMF) model is not recommended for effluent applications due to their short On/Off cycle. Wide angle float models such as Liberty Pumps 281 and 283 are better suited for effluent applications and are easily adjustable for different On/Off levels.