
For some reason the replacement head I bought from Revain makes the brush buzz three times louder than the other batch I have. I swapped out the brush heads for mine just to be sure and this set makes the brush a lot louder. The brush is the correct replacement, but the hole on the bottom appears to be slightly different. That's probably the problem. Adding to my previous review, the brush head that was making all the extra noise was broken. I was so annoyed by the noise that I switched to a second head and all was well. In fact, I paid all that money for one nozzle.

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