Description Are you looking for some co2 bottle caps? Are you in search of sturdy, trustworthy tools that can do multiple jobs at once? If yes, look no further! Our professional co2 bottle caps must meet you needs. It is one of the best choices for you. For people who love DIY CO2 setup, this bottle lid is a helper when they are doing the process of generating CO2. Features -Color:Light Brown -Material:ABS -Size:3.30X3.30X3.00cm/1.30X1.30X1.18in -ABS material makes this bottle uneasy to rust and safe for your fish and water plant. -Can be directly screwed onto carbonated beverage bottles, safe, durable and airtight. -If the water plant in your fish tank, aquarium is growing slowly and needs more CO2, this bottle may help you. -Suitable for all kinds of DIY reactors to meet your needs. Professional and durable. -Small size, light weight, it is easy to carry and store, will not take up a lot of space.