They are supplied with a venturi pump. The water supply to the skimmer requires a second pump with a capacity of minimum 2,000 l/h (app. 500 gph). The skimmer may also be directly connected to the overflow of the aquarium. In this case it is recommended to install a bypass to control the water flow to the skimmer, especially if powerful return pumps are used.
Total height with foam cup:
Shorty II: app. 73 cm (footprint app. 30 x 50 cm)