CO2 Diffuser,Govine CO2 Diffuser Glass Reactor for Aquarium Tank Plants This product is made of crystal glass with high quality,it can resist acid,alkali and erosion. Improve the growth & health of your plants with sufficient Co2 supply! They are small and beautiful with bending glass connection trachea and high transparency. It is designed for aquatic cylinder, simple and light, and it does not occupy a space. Size: The diameter of glass is 20mm / 0.79",the height is 65mm / 2.56".