This Dymax AP range air pumps represent leading-edge technology to bring you an efficient and reliable product, great for general aeration, running sponge filters or creating the visual effect you want in your aquarium. Dymax Air Pumps come in a range of sizes and will aerate and add oxygen to the water of any size aquarium or fish tank. Well-oxygenated water is beneficial to cold water, tropical and marine fish as well as all other living underwater creatures. The AP range comes with 4 dampers at the bottom of the housing so as to reduced noise and vibration. Suitable for cold water, tropical and marine aquariums. Available models: AP300, AP500 & AP700 AP300 spec: Outlets: Single Outlet Power / power per outlet: 300l/h Power watts: 2.5w Speed Control: No AP500 spec: Outlets: 2 outlets Power / power per outlet: 500l/h Power watts: 2.9w Speed Control: No Tank size: 120L/hour x 2 AP700 spec: Outlets: 2 outlets Power / power per outlet: 700l/h Power watts: 2.9w Speed Control: Yes Tank size: 150L/Hour x 2