Python manufactures this truly unique system. Makes water changes easy, designed to drain and fill aquariums plus use as a gravel vacuum. No need to carry heavy buckets of water to and from your tank, just hook this up to a faucet and siphon out water and then fill with fresh. Kit includes: hose, gravel tube, switch, faucet pump and adapter, and hose connectors. Available in a variety of sizes; just measure the approximate length from your tank to the nearest sink and order the size that's best for your set up.