Fish:Fish Tank CO2 System Generatorco2:Aquariumco2 aquarium:co2 regulatorco2 diffuser:Aquarium co2CO2 system is designed for low cost planted tank useEasily set up/low cost/excellent qualitySpecifications:Inside diameter:Approx 27.5 mmFor header pipe size:Outer diameter:6MMInner diameter:4MM color:White material:plasticPackage Contents:2* Bottle CapOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.
