Medium Bubbles: Produces abundant dense bubbles to aerate your water reservoirs. A great way to increase oxygen solubility in your aquarium and enliven the aquatic lives. Model: ASD100; Jetting volume: 12 L/min; Recommended air pump power: 4 W; Inner diameter of tubing: 3/16" or 3/8". Great for aquariums, DWC systems or ponds. Reliable Material: Made of mineral material and sintered at a high temperature, it causes no effect to the health of your aquatics. Keep fish or roots growing healthily. Stable in Water: Measures 4.1" D x 0.7" H and weighs 7 oz, which helps it sink to the bottom easily. And the 3 suction cups tightly suck the tank to make it sit stably in water. Easy to Use: Soak the stone completely in water for 1 hour before use. Clean it regularly with a brush as it gets clogged after weeks or months of usage. Product description Pawfly specializes in all must-haves of aquarium accessories such as air pumps, air stones, sponge filters, fish nets, cleaning brushes and other accessories to set up your aquariums. 4 Inch Air Stone Disc The 4 inch air stone disc features durability, steady bubbles and high dissolved oxygen rate. Optimal for aerating your water reservoirs and livening up your aquatics. A necessity to have in the house of aquatic lovers. Sintered with high temperature, it is well built to keep stable in water and produce constant bubbles for fish?s breath. Perfect for both fresh and salty water environment like fish tanks, ponds, DWC reservoirs, aquariums, etc. Abundant medium bubbles Required pumps: 4 W Fit 3/16" or 3/8" ID hose 3 strong suction cups Stable Ideal for fish and plants Soak for 1 hour before use Steady Medium Bubbles With large jetting volume of 12 L/min, the bubbler produces plentiful medium bubbles bursting steadily to increase oxygen level. Firm Suction Cups The 3 suction cups can be firmly attached to the tank and tightly fix the disc at bottom. Keep it stable in water for constant bubbles. Easy to Use Soak the stone in water about 1 hour before use. Clean it regularly as it gets clogged and replace it when not working properly.