ITEM NAME:aquarium bottle cap for live plants CO2 diffusers air generator system DIY To 3C 1.Please allow 0.5-1.0 inch differences due to manual measurement, thanks..This bottle cap is very well suitable to be DIY Co2 system’s accessory that the size fits common PET plastic bottle. CO2 system is designed for low cost planted tank use. It's worth to try and using it.
