Our CO2 bottle caps are versatile and can be used with various DIY CO2 generators. They are compatible with bottles, making them a practical addition to your aquarium supplies. These caps help maintain a consistent CO2 output, which is crucial for the healthy growth of your aquatic plants and overall aquarium ecosystem. Features -Color:Beige -Material:ABS -Size:3.30X3.30X3.00cm/1.30X1.30X1.18in -Note: inner diameter: 2.8cm -Leakproof design: quick tightening mechanism a leakproof seal, maintaining the purity of co2 gas -Multi-standard fit: precisely manufactured to fit various standard co2 cylinder interfaces, enhancing usability -High pressure material: constructed from materials that withstand high pressure, ensuring the stability of the cap and bottle -Easy to carry: compact and lightweight design makes it for outdoor activities like barbecues and camping - co2: efficient sealing reduces gas loss, extending the co2 usage time inside the bottle for long term storage Package list: 25 x bottle cap