Moen kitchen faucets are designed to be interchangeable, so you can easily switch out the faucet head if you need to. However, it's important to make sure that you get the right size faucet head for your particular model of Moen kitchen faucet. You can usually find the appropriate size information on the back of the packaging or in the instructions manual. Once you have the right size faucet head, simply unscrew the old one and screw on the new one. If you're having trouble getting the new faucet head to screw on tight, try using some plumber's tape around the threads to create a better seal.