This is a genuine Grohe product. For my use - replaces an obsolete product. I left the original inlet hose. If someone replaced the original supply hose ($45) it would probably fit perfectly. In any case, it works great judging by the feedback written by other users who have also had to adapt. I used the unused flow restrictor o-ring that came in the package; 2 different flow restrictors were supplied. (See review by M. Furukawa, July 9, 2013) It would be helpful if Grohe gave the consumer some up-to-date advice. The spray box contained 2 flow restrictors and a mechanical assembly drawing of the parts. very small drawing (ie too small to read), no written instructions. I understand that Grohe usually supplies installers and professionals who "just know how to do it"; However, since they sell to consumers, a small piece of paper with step-by-step instructions would be helpful. They may also include an O-ring for interchangeable attachments. Written instructions and an O-ring would have given it a 5 star rating.
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