Innovative Auto Siphon Pump, Quick And Easy. On/Off Flow Control Valve. Integrated Gravel / Fish Strainer. 6 Inch Tubing Included.Direction: Submerge Gravel Vacuum Cleaner Inside Aquarium. Place Other End Of Hose Into A Bucket. Open Up Flow Control Valve. Start Squeezing The Auto Siphon Pump Until A Siphon Is Created. Remove Fish Waste And Debris By Lowering Gravel Vacuum On Gravel. Adjust Flow Control Valve As Needed For Different Size Aquariums.Specification:Adjust Flow Control Value As Needede For Different Size Aquarium. Composition And Materials Are Plastic And Silicon. Innovative Auto Siphon Pump Quick And Easy. Integrated Gravel And Fish Strainer And 6 Inch Tubing Included. Can Be Extended Using Extra 16/22 Tube.