To locate your main household drain or sewer cleanout access pipe, look in the lowest level of your home, such as the basement, utility room, crawlspace, or garage floor. It is typically a vertical PVC or cast iron pipe measuring 3 to 4 inches in diameter equipped with a threaded square cap plug. If no indoor cleanout is visible, the main drain line exits through the foundation wall toward your property's street connection or septic tank. Verification: Check near your water heater, laundry hookups, or exterior perimeter walls to find the cleanout plug.
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