JBL ProClean Aqua Water Jet Pump for a fast and simple water change in your aquarium. Simply screw the JBL Water jet Pump on to water tap. Water current creates suction which siphons off water from aquarium. Connects to hose siphoning water from aquarium via sediment bell. Can be changed in an instant fromsiphon offtorefill. Even siphons water from aquariums positioned lower than washbasin.JBL ProClean Aqua Water Jet Pump+ the pump, which is screwed to the tap, creates suction from the flowing tap water so that water can be drawn out of the aquarium through a hose. After moving a lever, it can be filled again+ screw the water jet pump onto the water tap, connect the hose, open the water tap and move the lever position to select whether water is to be siphoned off or refilled+ the water jet pump is an element of the JBL ProClan Aqua IN-OOUT water changing set, but can also be purchased separately+ the water jet pump has a 3/4 inch threaded connection. It needs to be attached to t