Uniclife Aquarium 4m Airline Tubing Standard Air Pump 4 M, Clear/Red/White\nProduct Details\n--All In 1 Package: No Worry About Mismatching - Complete air pump accessories of airline tubing, air stones, connectors, suction cups and check valves for basic aquarium aeration setup.\n--4m Airline Tubing: Standard 4-6 mm ID airline tubing. Made of reliable frosty clear plastic, the hose is flexible, strudy and kink-resistant. Desired length for most fish tanks.\n--2 Air Stone Cylinders: 2 D x 3 H(cm). Small size to be easily driven by even nano air pumps. Produce lots of medium bubbles to aerate your tanks and enliven the aquatic lives.\n--4 Connectors: Include 2 straight and 2 T-shape connectors to connect standard 5mm ID tubing. Allow you to connect 1 or more air inlets to create 1 or more outlets.\n--6 Suckers & 2 Check Valves: Soft clear plastic holders fit 4-6 mm ID hoses and can stick tightly to the smooth tank. The check valves can effectively prevent back siphoning of water.