Submersible pumps. All pumps are 100% water tested, 25' power cords, and come with a 5 year warranty. These pumps come with a built-in prefilter to aid in the water filtration process. These magnetic drive pumps run by an electrically charged magnet that causes the impeller to spin and circulate water through the pump. Magnetic pumps are environmentally safe, have no coolants, and use less energy than direct drive pumps. No. 200452: 450 GPH, 1/2'' outlet No. 200850: 850 GPH, 1'' outlet