Can I use metric instead of inch?

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rony

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Hi
I am about to buy a stock of adapter for water purifier (faucet divertor. please see attached picture), some chinese factories only work with metric system and I wonder if I can use them. my questions are:
1. Some answers I got is that the most common tap would be 55/64(at the connection point to an aerator). Do you agree that this would be the most widely used?
2. Since it is 22mm metric vs. 21.83mm (55/64inch x 25.4mm), and since factories that work with the US make only metric, can I assume that 22mm is also used in the US (no damage and no leaking?).
Thank You

mounting_on_tap.jpg
 
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