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Troubleshooting: first check that nothing is blocking

Troubleshooting: first, check that nothing is blocking the vent pipe opening on your roof sometimes birds or other animals build nests on top of un-enclosed vent pipes for warmth also check under sinks for gulp valves gulp valves are typically mounted at the end of a drain line and look like a plastic cap from a can of spray paint the valve prevents sewer gas from escaping the drain line but lets air into the vent pipe when there's enough suction if you fill the sink with.

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