Our CO2 bottle caps are not only functional but also aesthetically pleasing. Their sleek design blends seamlessly with your aquarium setup, ensuring that your CO2 system remains discreet yet effective. These caps are an essential accessory for any aquarium enthusiast looking to optimize their CO2 system. Features -Color:Beige -Material:ABS -Size:3.30X3.30X3.00cm/1.30X1.30X1.18in -Note: inner diameter: 2.8cm -Effective sealing: quick tightening design a secure seal, preventing co2 leakage and maintaining gas purity -Broad compatibility: precision manufacturing allows for compatibility with various standard co2 cylinder interfaces -High pressure durability: made from high pressure resistant materials, ensuring the stability of the cap and bottle -Convenient portability: compact and lightweight, making it easy to carry for outdoor activities like barbecues and camping -Extended co2 lifespan: efficient sealing technology minimizes gas loss, extending the co2 usage time inside the bottle for long term storage Package list: 5 x bottle cap