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On my trailer with washer installed that hose is sealed around the top of that drain tower and the other part of that system is a springloaded vent valve that sloows air to enter the pipe to assist effecient drainage from the washer but not allow anything, including gases, to exit that vent.
If you do not have a washer installed in that drain pipe and are not using it, you could very easily plug it with some thing to prevent fumes. It is not required to be left open for venting purposes.
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Sandra, Bruce
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