【Air Pump Accessories】: 2 bubble stone vents. Perfect for your aquarium or fish tank, and it is the best partner for the air pump. 【Air Stone Bubble Release】: This bubble stone vent will create a much more abundant cascade of tiny bubbles than you can ever imagine. Perfectly increase oxygen content, reduce CO2 and raise PH. 【Very Quiet】: The high-quality bubble stone vent has a solid and porous structure and impresses with its high air permeability. Very quiet operation. 【Outstanding Quality and Reliability】: Durable, washable and sintered at high temperature. The bubble stone vent can be used for a long time and easily washed for reuse. Note: Long-term use, when dirt is blocked and air bubbles are reduced, it can be removed and washed repeatedly. Sold as a single air stone, without air hose and other accessories, please soak this product in water for 15 minutes before use. Product Description The air stone perfectly increases oxygen levels, reduces CO2 and raises PH. Creates water