ALL-IN-ONE SET: Don’t worry about incompatibilities - Complete air pump accessories including air tubes, air stones, connectors, suction cups and check valves for air pump setup base of the aquarium aeration. 4m. Air Tube: Standard 5mm inner diameter air tube. Made of reliable frosted clear plastic, the hose is flexible, durable and kink resistant. Desired length for most aquariums. 2 Cylinder Air Stone: 2D x 3H (cm). Small size to be easily driven even by nano air pumps. Produce lots of medium bubbles to aerate your tanks and animate aquatic life. 4 Connectors: Includes 2 straight connectors and 2 T-shaped connectors to connect standard 5mm ID tubing. Allows you to connect one or more air inlets to create one or more outlets. 6 suction cups and 2 check valves: the transparent flexible plastic supports adapt to pipes with an internal diameter of 5 mm and can stick to smooth tank firmly. Check valves can effectively prevent water siphoning. Color as shown Package Quantity: 1 set (as