Place a small towel or bucket directly below the water supply line connection at the bottom of the toilet tank to catch any drips. Using an adjustable wrench or channel-lock pliers, grip the coupling nut on the supply line and turn it counter-clockwise to loosen it. Once loose, you should be able to unscrew it the rest of the way by hand.
This guide provides comprehensive, step-by-step instructions for fixing a leak at the base of a toilet. The process involves shutting off the water, removing the toilet, scraping away the old failed wax ring, inspecting the mounting flange, installing a new wax ring and bolts, and carefully reinstalling the toilet to create a new, watertight seal.
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