• MEDIUM/5 INCH • A simple way to perform quick water changes and clean gravel. • Just a simple up and down motion with the intake tube will quickly prime the siphon to begin water flow. • Debris is pulled away with flowing water and disposed of while gravel falls to the bottom of the aquarium. • Recommended for use in 5 to 20 gallon aquariums. • Includes 6 foot flexible hose, self priming intake tube and hose clip.