Replacing the entire under-sink plumbing assembly—including the tailpiece, slip-joint nuts, baffle tee, P-trap, and wall stub-out connection—typically costs between $200 and $450 when hiring a professional plumber. If you purchase a standard PVC or ABS sink drain kit from a hardware store and perform the replacement yourself, materials will cost only $15 to $35, requiring basic hand tools and an adjustable wrench. Verification: Run the faucet at full volume after installation to verify smooth drainage and check all slip joints for leaks.
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