The Liberty Pump 457 is an automatic submersible sump pump with 1/2HP that has a magnetically operated vertical float (VMF) switch. This switch allows this sump pump to operate in sump diameters as small as 10". The Liberty Pump 453 automatic 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". This submersible sump pump is equipped with a motor design that can reduce electrical usage by 40%. The Liberty Pump 450 manual submersible sump pump should not be run dry in order to prevent excessive seal wear and overheating. The motor on this sump pump is thermally protected and permanently lubricated to increase durability.