High-grade polished stainless steel CO2 diffuser, durable as well as elegant, adding a beautiful scenery to your aquarium.Ultra-thin shape, installed in the bottom can increase the efficiency of CO2 dissolved in water.An indispensable item for your fish tank or aquarium, durable and reliable.It is easy to clean and replacement, very convenient.Replacement CO2 diffuser disc, high-density with silicon sealing ring, does not easily block.Helps to ensure plants receive proper amounts of CO2, improve the growth and health of your plants with sufficient CO2 supply.The CO2 diffuser disc must be screwed as tight as possible when installation.Tow sizes available: Dia. 2cm/ 0.79 inch; Color: blue + whiteMaterial: CeramicPackage Contents2 * Fish Tank Carbon Dioxide Slice KitOnly 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.