Posted a similar european faucet problem on this site. The excellent response by Double A suggested using 3/8 compression which he used on Grohe and checking size with a micrometer. I found that the 3/8 sleeve was a tad large so I ordered 10mm compression fittings from a place called Maryland Metric. They seem to have everything but are no help whatsoever unless you know what you want.
hi, Im in the same boat as you were. I bought a kitchen faucet on Ebay (nice faucet) but it has metric threading on the supply lines. I need to extend the supply lines to make it work and all the supply lines at the store are SAE and not metric. How did you ever solve this problem? Thanks in advance for the help.
San Antonio, Texas
some of the plumbing items sold on ebay do not fit american standard. Some time it is worth asking the seller whether the products are american standard. I bought my bathroom sink faucets from oversea and when its time to install them, we realized that the stems were shorter than the ones that is built to the american standard. We had to buy extension for them.