Aquarium Fish Tank Glass Spiral CO2 Diffuser Aquatic Plants Moss Airtube Refiner

Specification: Material: Glass Color: Clear Length: 15cm / 5.91''(appr.) ? Features: * For 4/6mm CO2 tube (not include). * High efficiency of diffusing carbon dioxide. * CO2 bubble counter is built in this device. * Suitable for tanks 40 - 75 gal (120L - 280L). * Easy to install and use, with no extra power required. ? Package included: 1X CO2 Diffuser (sucker shown in the picture not included)