Commonly used for keeping pelagic and loose benthic fish eggs in circulation during the incubation period. The 2-liter jar has a smooth domed bottom and sides to ensure eggs do not get damaged while tumbling. Designed to hang on the side of a tank, or it can be used with the optional PVC stand. The complete kit includes a submersible water pump, valve assembly, larval collector and the egg hatcher. Measures 12" H x 6" diameter.