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Diffuser Airstone is the secret ingredient for efficient aeration! These 7" Stones are manufactured with a large base to ensure the stone is sealed to the basecorrectly, forcing air out of the micro-pores in the stone. If holes are too big, you will get big bubbles. If they are too small, you don’t get adequate circulation. This stone has proved itself for more than 20 years.
Airstone has a 1/2" MPT threaded connector.