This DIY CO2 generator bottle cap is designed for creating a convenient and efficient carbon dioxide system for your aquarium. Its multi-functional design ensures compatibility with various bottle types, making it an essential accessory for aquarium enthusiasts. The cap is easy to install and provides a secure, leak-proof sealing. Features -Color:Beige -Material:ABS -Size:3.30X3.30X3.00cm/1.30X1.30X1.18in -Quick tightening design CO2 generator bottle cap: features a fast-twist mechanism for secure sealing, ensuring minimal gas leakage and optimal co2 retention for extended use -Easy operation CO2 generator bottle cap: simplifies diy co2 generation with a user-friendly design, making it ideal for beginners and experienced users alike -High-pressure resistance: built to withstand high-pressure environments, maintaining the stability of both the cap and bottle structure during use - construction: made from materials to no-need for frequent replacements, saving time and money -Enhanced gas efficiency CO2 generator bottle cap: minimizes co2 loss, extending the usability of the gas inside the bottle, suitable for long-term storage needs Package list: 8 x CO2 generator bottle cap