The plumbing pipes located directly underneath household sinks typically consist of PVC (polyvinyl chloride) or ABS (acrylonitrile butadiene styrene) plastic, though older homes may feature chrome-plated brass or cast iron tailpieces and P-traps. Drainage setups include the vertical tailpiece connected to the sink basket, the curved U-bend P-trap that maintains a standing water barrier to block sewer gases, and the horizontal branch tailpiece extending to the wall stub-out. Verification: Inspect your under-sink fittings visually to identify whether you have modern plastic slip-joint piping or older metal components.
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