If a Moen faucet continues to leak after you have installed a brand-new cartridge, the problem is typically caused by trapped mineral debris, scale buildup, or rubber seal displacement inside the valve body. Turn off the water supply, pull the new cartridge back out, and thoroughly inspect the interior brass housing for accumulated calcium deposits or old rubber washer fragments that prevent proper sealing. Cleaning the internal chamber with a vinegar solution, ensuring the retaining clip is fully seated, and clearing the lines usually resolves the persistent drip.
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