Step 2 · Locate and Prepare the Cleanout

Locate the main sewer line cleanout. This is typically a 3- to 4-inch diameter pipe with a screw-on cap or plug. In this case, we are assuming it is located outside the house, close to the foundation. It may be at ground level or sticking up a few inches. Clear any dirt, grass, overgrown plants, or other debris from around the cleanout cap so you have a clean, safe working area and can get an unobstructed grip on the plug with your pipe wrench.