Koller Products Aqua Lift is ideal for moving small amounts of water from one place to the next, up to a height of 24 inches. Perfect for topping off aquariums, dosing reef supplements, drip system for reptiles' terrariums, priming gravity fed siphon tubes and acclimating new fish and corals to your tank's water. Aqua Lift is designed for external use only; do not submerse or damage to the pump may occur. This self-priming pump should be mounted or positioned above the aquarium or sump water level. The Aqua Lift can be securely mounted using a S hook (sold separately). If smaller amounts of water are to be dosed or a lower flow rate is required, the Aqua Lift can be switched on and off for varying periods of times. For exact dosing, a digital timer programmable in minutes should be used along with the Aqua Lift.