To change the O-rings on a Moen kitchen faucet, start by shutting off the hot and cold water supply valves under the sink and opening the faucet handle to relieve pressure. Remove the handle cap and set-screw using an Allen wrench, pull off the handle, and remove the spout retaining clip or spout body. Slide the old worn rubber O-rings off the spout base, clean away any mineral scale, apply plumber's silicone grease to the new O-rings, slide them into position, and reassemble the faucet. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before beginning repairs. Verification: Turn the water supply back on and swivel the spout to confirm zero water leaks around the base.
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