Aqueon Siphon Vacuum Extender Aquarium Gravel CleanerThe Aqueon Siphon Vacuum Extender Aquarium Gravel Cleaner was developed to make routine water changes and vacuuming gravel easy and efficient for any level aquarist. Extending design allows you to adjust to your specific needs. Auto-start valve makes water siphoning easier than ever. Simply shake the vacuum up and down a few times while submerged in your aquarium and the water will begin flowing automatically. Includes a clip for attaching the drain hose to the inside of a bucket.