Description Do you need a durable CO2 bottle caps? If so, take a quick look at these CO2 bottle caps. Made of superior materials, durable and long-lasting. Unique design and exquisite craftsmanship ensure its popularity and practicality. If the water plant in your fish tank/aquarium is growing slowly and needs more CO2, this bottle lid may help you. Features -Color:Light Brown -Material:ABS -Size:3.30X3.30X3.00cm/1.30X1.30X1.18in -These bottle caps are very well suitable to be DIY Co2 system’s accessory that the size fits common plastic bottle. -Easy to assemble and mount, will not consume too much time and energy. -The workmanship of this product is perfect, and you will have a good experience in using it. -Add and control the amount of CO2 available to your fish and plants, add essential CO2 into your aquarium water. -Increased work efficiency and saved work time, which can give you a great usage experience.