Cost to Replace a Drain Pipe Under the House. Replacing a drain pipe could require as much as Unless you can see a clog through a drain or a cracked pipe under a sink, you may not be able to Drain lines run from sinks, bathtubs, showers and toilets to your sewer pipes located underground. Drain Traps are easy to replace. This Home Depot guide walks you through the process of replacing drain traps underneath your sink. The curved pieces of drain pipe underneath your sink, commonly referred to as p-traps, do a lot of dirty work. Over time they

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