This is a new DC transformer replacement air pump for BiOrb aquariums. The air pump works 24 hours a day, and like all mechanical parts, will eventually wear out. You may notice that the pump becomes noisier or the bubbles less vigorous, at which point it may be time to replace your air pump. Replacing the air pump is simply a case of unplugging the old one and plugging in the new. Simple instructions are supplied. If your air pump stops working, replace it. This pump is for use on BiOrb Aquarium setups that are in the new DC range and will not work with older AC accessories or systems. It is a genuine BiOrb Air Pump and is easy to install, as it plugs straight into the DC Transformer. It is suitable for all DC powered Aquariums and has the part number 70371.