The built in supply lines have delicate tubes in them. Installation Got this about 3 years ago. instructions were not specific enough about preventing them from twisting during install. Would have helped to have a second wrench on it for that. Had an awful time getting water flow established on one side. Then, the faucet is pretty and does a nice job. I have to adjust the position of the counter weight under the sink from time to time. There seems to be a lot of plastic in the construction and I wonder how long it will hold up.