According to the enclosed instructions, an adapter is included. no It's just a male bypass valve that will only fit on a faucet of the same size. The instructions also say that if it doesn't fit, then buy a universal faucet adapter. I have made. Several adapters fit my sink, but NONE fits the diverter valve on the filter! There is something unusual about this switching valve. I'm sure it fits some type of faucet, but I don't know which one because it has to be about a 1" FE (female) faucet. I have written 2 emails to the company and they have not responded to any of them. I even asked for the exact size of the valve to find the right adapter. No Answer. My personal opinion is not to buy this item as the company is not service minded and you run the risk of it fitting in your sink. As I said, the diverter is about 1 inch. This is an assumption as it's a bit difficult to measure accurately with a ruler.
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