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Title: Caveat Emptor!
Review: The design of this product is very poor if you need to use it on a faucet with inside threads. That was the case with mine and it fell of within miutes of installation. Even when it stays on you can't really touch it without it falling off. FWIW, I've remodeled and installed several bathrooms and kitchens - I'm very familiar with plumbing. I went over everything carefully when I installed it and even tried alternate washers to see if they might get a little extra more room for the threads to engage. The bottom line is that the insert is under-sized for the load the filter and water pressure put on it. They should have made the insert longer and probably out of brass or something more substantial than the plastic they used. Britta should be ashamed of putting their name on this product. Don't waste your time with this if you sink threads are on the inside of the faucet. I don't know about using it with externally threaded faucets but I would look for a better overall engineered unit.
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