Features: An essential item for matching water that we also love in our store. You can gradually match delicate fish and shrimp that are weak due to water quality changes. You can easily adjust the speed of the water matching with the cock. The included air stone prevents sucking in small organisms. Convenient for piping air tubes, pressure resistant tubes, water matching, etc. How to Use: Attach suction cups and air stones to one side of the air tube. Attach the stok to the tip of the other air tube. Attach the suction cup side to the water in the aquarium, and attach it to the inside of the aquarium, and take it to the bucket where you want to match the cup side. Lightly suck the water from the side of the cook, and adjust the water when the water comes out, and adjust the amount of water flows. The time may vary depending on the biology that you are aligning with the water, but take more than an hour to mix it up with water, and then introduce the organisms into the aquarium. Set Contents: 1 round air stone, silicone tube, milky white, 6.6 ft (2 m), 1 cock, 1 kissing rubber (diameter 0.7 inches (1.8 cm)). *Air stone, kissing rubber, tube color and shape cannot be selected. Note: This product is an ornamental fish. Do not use for any other purpose than the intended purpose.