Inexpensive molded diffusers, 3/16" barb inlets.
Available in: 1", 4", 6", 8", and 12".
Questions on Blue Durable air stones
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they work Review by sampsonnite420
none where broken in the transportation to my house. they dont last forever, unless you presoak them for about an hour first in water. then hook them up to your airpump.. (Posted on 12/3/2011)