Liberty Pumps 280 Manual 1/2 HP Mid Range Head Submersible Sump/Effluent Pump Vortex style impeller permitting passage of solids up to 3/4" Permanently lubricated upper and lower ball bearing 416 stainless steel rotor shaft - Epoxy powder coat finish All fasteners - corrosion-resistant stainless steel Stainless steel bottom screen - easily removable