Air Stones Disc Bubble Diffuser High Dissolved Release Tool Bubble Stone Aerator for Pond Pumps Circulation System High Dissolved: This Bubble Stone Aerator can release a large number of fine bubbles, increasing the contact water area, driving the cycling of water, and increasing the amount of dissolved. Quality Material: The Air pump stone disc is used to increase the fish tank's hydroponics. for long term use, if the is clogged and the air bubbles are reduced, it can be cleaned and used repeatedly. Easy to Use:bubble diffuser release tool is a great accessory to properly aerate a home aquarium/medium fish tank, a round surface wrapped to prevent air leakage, and flat bottom make the stone place steady without the suction cup. Fine Dense Bubbles: Durable frosted material of the aquarium bubble stone with a small air outlet can release fine and dense bubbles, creating water currents. Our versatile air stones also be used for decorative air bubbles equipment. Universal Applications: The Air Pump Stone bubble diffuser is made of durable Sand, with a connector to suit fish tanks. (air pump and air tube are not included) Size Chart: S: Diameter: 5cm/1.97inch, interface diameter: 4mm/0.16inch. M: Diameter: 10cm/3.94inch, large interface diameter: 8mm/0.31inch, small interface diameter: 4mm/0.16inch. L: Diameter: 13cm/5.12inch, large interface diameter: 8mm/0.31inch, small interface diameter: 4mm/0.16inch. Package Includes: 1 Air Stones Disc Bubble Diffuser Note: Please allow slightly errors due to manual measurement and different monitors.