Easy set up, simply, nano, excellent design. Attached with high quality plastic “O” ring inside of the cap to prevent missing the carbon dioxide.
This bottle cap is very suitable to be DIY carbon dioxide systems accessory that the size fits common PET plastic bottle.
Aquarium Bottle Cap
Material: ABS Plastic
Features: Useful, Easy to Connect, Fish Tank Accessories
The Connect Tube Head Inner Diameter: 4mm/0.16″ (Approx.)
The Connect Tube Head Outer Diameter: 6mm/0.24″ (Approx.)