A Moen kitchen faucet leaking at the base is almost always caused by degraded or flattened rubber O-rings located inside the spout swivel assembly. Over years of pivoting the spout left and right, friction and hard water wear out these waterproof seals, allowing water to escape past the brass body and pool on your countertop. Alternatively, a loose mounting nut under the sink can allow the entire body to rock and leak. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before beginning repairs. Verification: Turn the water back on and swivel the spout to confirm zero leaks around the base.
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