AquaClear Powerhead #20-V 76LAquaClear Powerhead 20 is a multifunctional pump that delivers outstanding performance in a variety of applications. It can efficiently drive undergravel filters, circulate and aerate aquarium water, and attach to filtration accessories such as the AquaClear Quick Filter to support crystal clear water conditions. Powerhead 20 comes with a venturi aeration valve that raises oxygen levels, which is important when water temperature or fish population