I bought the vent because I was tired of constantly the usual air stones (without suction) to push back under a rock or bury in the sand. My perch leave the parts not alone.
Only a small note:
The bubbles gush from the white circle of the outflow, not out of the slot in the middle. I had received the first and was surprised. The suction cup holds well, with low outflow setting (valve strongly turned off) sources only in a few places bubbles out what looks somehow strange. But does not matter if you placed so that you can not see the vent him.
Would I buy it again.
