ADA Style Clear Glass CO2 Diffuser. The ultramicroporous ceramic plate is made with special technology and produces uniform bubbles to achieve the best dissolution efficiency. The material used is anti-aging, corrosion-resistant and permeable. Each diffuser comes with a pair of suction cups. Very easy to install. * Very important to let the diffuser soak in a container of water for 24-36 hours before its first use. Several sizes available in store: Diameter ranging from 2 cm to 5 cm.