Air Stone Rectangular 3in

3″ Air Diffuser with 1/4″ barb
High quality, durable air diffuser stone.

• Must be connected to an air pump with airline tubing.
• Produce a steady stream of uniform-sized bubbles
• Resistant to clogging

Air pumps with stones are recommended for preventing stagnant water (where mosquitos like to breed), and creating proper aeration to sustain pond wildlife, including koi and goldfish.
Having an air pump can be a literal fish-lifesaver in the case that your water pump fails, by maintaining the oxygen level in the water that your fish need to survive.