When an under-sink rubber gasket or slip-joint washer begins leaking, you can usually fix it without replacing the entire pipe assembly. First, place a bucket underneath the P-trap to catch residual wastewater. Use your hands or an adjustable wrench to loosen the slip-joint nut, slide it back, and inspect the rubber washer inside. If the washer is flattened, cracked, or deformed, replace it with an exact-matching replacement washer, wrap Teflon tape around the male threads if needed, and tighten the nut securely. Verification: Run the faucet and place a dry paper towel beneath the joint to confirm zero leaks.
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