Penn Plax Gravel-Vac Aquarium Gravel Cleaner Extendable 9-16" LongA super aquarium cleaner, scraper, and siphon all in one. This Gravel Vac is designed for the removal of grungy waste, dirt layers, and debris from the gravel bed at the bottom of your aquarium. The vacuum features a unique scraper that reaches below the gravel line for a proper glass cleaning, without scratching the glass. The gravel vacuum also features an easy to use self starting siphon for easy routine maintenance of your fish tank. Easy to use