Our cO2 Diffuser can improve the growth and health of your plants with sufficient cO2 supply The ceramic refinement piece has atomic pores on its surface, which can produce fine bubbles that rise slowly and ensure efficient diffusion of carbon dioxide in the aquarium With the suction cup, it is easy to install and operate and can fix on the aquarium firmly And the fine, see-through glass is blended in the environment of aquarium, which can create a sense of harmony and unity Package Included: 1x cO2 Diffuser 1x U Shape Tube 1x check Valve 1x Suction cup Note: This cO2 diffuser set only can be used for carbon dioxide and need to soak for more than 48 hours for the first use for maximizing product performance and prevents from rupturing due to sudden inflation It is recommended that always wet the glass tubing before inserting the silicon or rubber tubing to avoid damaging glasswareAlthough this diffuser set is made of high quality glass materials, fragile and damage canAt be avoided because of the long distance logistics transportation Please just contact us for a new replacement or refund when you receive any defective peoductsPlease do NOT use brushes or wipe with any cloth to clean the ceramic surface to avoid micropore blocking If ceramic diffuser disc is dirty, please change it or use special cleaner to clean it