Airline tubing with 4mm diameter in black, can be used for both oxygen and CO2 tube connections.

• High quality flexible silicone airline tubing for aquarium/
• Soft and flexible material resists kinking and provide durability.
• Black color provides a great contemporary look for the aquarium.
• Silicone material provides reliability for freshwater and marine aquarium.
• Unlike other PVC airline that harden up over time.