TOM TM1137 Aquarium Aqua Lifter Pump 3.5gph flow rate to 30" height. KollerCraft is highly regarded for supplying superior quality, innovative pet products and reliable service. This unique, one of a kind dosing pump is designed to pump water up to 30" high and at a flow rate of 31/2 gallons per hour. Ideal as a dosing pump for reef additives, drip systems for reptile terrariums and as a circulatin g pump for wat erfalls and gravity fed siphons