This item is also known as a return tube, it is used to return the water back into the aquarium.
Suction cups fasten to the inside and the outside of the aquarium for a secure fit. It swivels to allow close aquarium wall positioning.
The hose adapters on the one end will fit either 1/2" or 3/4" flexible tubing. The end that goes into the aquarium is 1" MPT.
