Thread of aerator is depend on faucet design
For faucet design, there is difference between American market and European market
For American market, they use American thread which is Female 55/64-27unsd-2b, Male thread 15/16-27uns-2a, also have dual thread which is 55/64-27unsd-2b&15/16-27uns-2a
European market also defined by Female thread and Male thread, but it use metric thread standard
For Female thread they usually called M22 , and for Male thread they use M24
So depending on this kind of situation
For American market, usually need to supply Female 55/64-27unsd-2b faucet aerator and Male thread 15/16-27uns-2a faucet aerator
For European market and Asiz market, need to change to M22 faucet aerator and M24 faucet aerator
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