AMLPH0660 The powerhead delivers a constant flow and provides increased surface agitation. The powerhead also includes a venturi with an adjustable aeration valve and 8'' of tubing to maximize oxygenation. Penguin's single moving part construction means no messy assembly; no oiling and virtually no maintenance. The epoxy sealed moisture-proof motor and electrical components ensure safe operation in both freshwater and saltwater aquariums. Size: Powerhead: 2'' long x 4'' wide x 4'' high 047431686601