Green Bubble CO2 Nut - cap for a home CO2 kit bottle.

- very durable
- for standard 6mm hoses
- for a standard cola bottle

The caps are characterized by high resistance - even with strong tightening, they do not crack. They can easily withstand pressure up to 5 bars. They allow for the creation of a hermetic system for dosing CO2 fertilizer in an aquarium, both using the homemade "bubbler" method and a mixture of soda and acid.

Thanks to the built-in seal, the caps ensure complete hermeticity.

In addition, they are equipped with handles on the top and bottom that fit standard hoses with a diameter of 6mm.