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Jan 01, 2012 · A backwater valve is simply a device in the waste pipe that prevents sewage from flowing back into the building. When the city sewer in the street backs up downstream of your connection, there is a potential for the upstream flows to find their way into your building and work back uphill to your fixtures.
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Understanding Backwater Valves - PHCP Pros
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Mar 18, 2021 · The hole needs to be big enough to hold the backwater value. The specific dimensions of the valve will be included in the box when you purchase it. The hole needs to be both as wide and as deep as the valve. Step 3 - Dig Even More. Dig out an area around the sewer line where you will be installing the backwater valve.