Upgrade your Python No Spill Clean 'N Fill Aquarium Maintenance System and make routine water changes even more convenient. The Python Hook is the perfect companion for your Python No Spill Clean 'N Fill to ensure easy refill of aquariums with clean, fresh water. When it is time to fill your aquarium, remove the Gravel Tube and replace it with the Python Hook for a convenient helping hand when filling your aquarium. Rugged, rigid design hooks onto your aquarium rim with added stability and security. The Python Hook is constructed using only the highest-quality American-made, BPA, arsenic and lead-free materials.