Description Are you looking for some co2 bottle cap? Are you in search of a sturdy, trustworthy tool that can do multiple jobs at once? If yes, look no further! Our professional co2 bottle must meet you needs. It is one of the best choices for you. Features - Color: As Shown. - Material: ABS. - Size: 3.30X3.30X3.00cm/1.30X1.30X1.18in - This CO2 bottle is suitable for most kinds of DIY reactor. - Easy to use. Just screw the bottle on the drink bottle. Easy and sealed without letting the air out easily. - Plastic material makes this bottle uneasy to rust and safe for your fish and water plant. - For people who love DIY CO2 setup, this bottle is a helper when they are doing the process of generating CO2. - If the water plant in your fish tank/aquarium is growing slowly and needs more CO2, this bottle may help you. Package list: 4 x bottle caps