Features
1. Small but Enduring: Each cylinder measures 2.2cm/0.87in D x 2.2cm/0.87in H. Small but well-constructed for continual bubbling. Ideal for small fish tanks or aquariums.
2. Medium Bubbles: The air stone cylinders produce a good amount of dense bubbles. A great way to increase oxygen concentration in your aquarium.
3. Connectors: Include 2 straight and 2 T-joint connectors to connect standard 4mm air tube. Allow you to connect one or more air inlets to create one or more outlets.
4. Suckers & 2 Check Valves: Soft clear plastic holders fit 4mm/0.16in air hoses and can stick tightly to the smooth tank. The check valves can effectively prevent back siphoning of water when the airpump is off.

Package include
1. 4m/13.12ft of 4mm air tube
2. 2 x check valve
3. 5 x suckers
4. 2 x air stone
5. 2 x straight connector
6. 2 x T-joint