The Liberty Pump 451 automatic submersible sump pump is a 1/2HP sump pump with a quick disconnect wide-angle float switch. This sump pump is equipped with a motor design that can reduce electrical usage by 40%. This submersible sump pump has 1-1/2"NPT discharge and can handle solids up to 3/8". It also has a max lift of 34". The Liberty Pump 450 manual submersible sump pump should not be run dry in order to prevent excessive seal wear and overheating. This sump pump requires a minimum sump diameter of 14".