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The valves under the bathroom and kitchen sinks are called “air admittance valves”. Many times the valves are not screwed in tight and leak. Remove the valve, wrap the threads with Teflon tape and then screw in snugly. If the vent riser is open and not plugged then you can not have pressure in your black tank. I am pretty sure the smell problem is the air admittance valve, very common problem.
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