Accessories Includes: 4 x Return Valve,4 x Air Stone,12 ft Airline Tubing
12 Feet 3/16"(4mm) Inner Diameter Air Line Tubing, Suitable for aquarium, fish tank and hydroponics.
Flexible Air tubing, Without kinking that stands up to wear and will not crack or become brittle over time.
All In One Package - No Worry about Mismatching
4 air stone, 0.6 x 1 inch (D x H). 1 inch Airstone can be easily driven by even Nano air pumps.
4 Non-Return Check Valve.