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The coupler design for the connection is supposed to be fairly simple, and I imagine there's a handy tool that allows one to pull up on the collar while pulling the hose. I didn't have one of those. After wrestling with it under the sink for 1/2 hour, I gave up and pulled the entire faucet out. While I pulled the collar, my wife pulled the hose. It eventually came out. Once I got the old one out it was easy to put the new one in