Quantity: one piece Purpose: suitable for medium and large aquariums This aquarium gravel cleaner makes water changes easier. It helps you clean your aquarium easily and quickly. Ideal for routine maintenance, changing aquarium water and removing manure and food debris from gravel. The aquarium stone crusher consists of several parts 'a total length of 2.6 m. The water outlet has a water flow control valve so you can control the water flow on and off. Simple and convenient to use. Its flexible transparent PVC hose transfers liquids faster. If desired, you can add additional hoses to the faucet (additional hoses not included). The water inlet is designed as a suction cup with a built-in filter to prevent juveniles, small fish or fine debris from being sucked out of the aquarium. It also prevents large gravel from being sucked in and clogging the entire siphon system. The operation is simple, just put the water inlet into the aquarium, put the water outlet into the bucket, open the tap and squeeze the siphon pump until the water flows out automatically. You can lower the water inlet to help remove manure or food debris. Note: Please keep the water outlet lower than the water inlet to let the water flow out automatically. Aqua Gravel Cleaner is made of high quality plastic and is guaranteed to last long-term use. It is detachable and can be divided into different parts that you can adjust and change according to your needs. Easy to clean and store. Good quality product