The Python 25 ft. No Spill Clean & Fill w/ Python Hook & 24" Extended Length Gravel Tube Package combines the: Python 25 ft. No Spill Clean & Fill; Python Hook; and Python 24" Extended Length Gravel Tube. The 24" Gravel Tube will allow you to clean the bottom of a deeper tank without getting your hands wet. The Gravel Hook replaces the Gravel Tube and holds the water line securely to the side of your tank when you refill the tank.