Replacement BiOrb 12 volt Air Pump. This is the only air pump currently manufactured for the BiOrb aquariums. It may be smaller and have less output than the air pump you currently have on your BiOrb, but it is the only air pump available, and its output is adequate. NOTE: On the box this air pump is listed as being for the Baby BiOrb. However, the the manufacturer of the BiOrbs maintain this is the BiOrb air pump being manufactured and it"s adequate for all BiOrb models.