Pawfly 2 PCS Large Air Stones Cylinder, 4 x 2 Inch Aerator Bubble Diffuser for Ponds, Aquarium or Fish Tank Price: $9.99 (as of 02/01/2024 23:51 PST- Details)

Medium Bubbles: With lots of micro holes on the air stones which allow abundant dense bubbles to spout from the cylinder. An ideal way to oxygenate your tank and enliven the aquatics.
Model: ASC100; Jetting volume: 5 L/min; Recommended air pump power: > 7 W; Standard ID airline tubing: 3/16″. Great for aquariums, DWC systems or ponds.
Reliable Material: Made from durable and washable silicon carbide, it causes no effect to the health of your aquatics. Help keep fish or roots growing healthily.