To properly seal a leaking pipe connection beneath your sink, you must disassemble the joint, inspect the rubber slip-joint washer, and reassemble it securely. Never rely on exterior tape or silicone caulk over a wet joint. If threads are leaking, wrap male pipe threads with fresh Teflon (PTFE) tape. For slip-joint connections, ensure the beveled edge of the rubber washer faces the correct direction toward the fitting before hand-tightening the slip-joint nut. Verification: Open the water supply valves and run the faucet to verify that all under-sink joints are completely dry.
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