Grundfos Pumps Corp. offers three models of its lightweight, corrosion-resistant, stainless steel sump pump. It features manual and automatic operation and will pump up to 31 feet of head. It is offered in 1/4 hp, 115-volt, 1-phase; 1/3 hp, 115-volt, 1-phase; and 1/2 hp, 115-volt, 1-phase models and can also be used in dewatering and water transfer applications. Grundfos Pumps Corp.