The air stone looked great in the box but when I connected it to the air large bubbles came out of a spot near the fitting. Upon closer inspection, it turned out that the epoxy had cracked around the entire perimeter of the stone. I would have sent him back, but I urgently needed oxygen in the carp pond. I removed the crappy epoxy and did the job myself. Now works as advertised would give it five stars if I didn't have to do someone else's job.
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