These work but do not deliver true 2.2 GPM flow as advertised. I replaced the 1.2 gpm aerator with these 2.2 gpm aerators and measured the flow before and after with a 20 ounce cup and timer and the flow was exactly the same with them, maybe even less ! The bottom line is that they work, but don't expect a 1.2 GPM increase in flow over a typical aerator.
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