If your under-sink P-trap is leaking at the joints, the issue is typically caused by loose slip-joint nuts or a degraded plastic or rubber washer inside the fitting. Place a bucket under the trap, and use your hands or an adjustable wrench to gently tighten the slip-joint nuts clockwise. If tightening fails to stop the drip, disassemble the trap, inspect the internal washers for cracks or wear, and replace any damaged rubber washers before reassembling securely. Verification: Run the faucet and place a dry paper towel beneath the P-trap to confirm zero leaks.
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