Aqua Medic produces the universal Ocean Runner series of submersible powerheads. These pumps can be operated submerged or outside the aquarium or sump. They are quiet, energy-efficient and supplied with a rugged pump housing. One year Manufacturer's Warranty for moving parts from Aqua Medic. Bulkreefsupply.com carries the Ocean Runner 2500 rated to 625 GPH and the Ocean Runner 3500 rated to 925 GPH.