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Old 07-10-2017, 09:40 PM   #2
Buckshot
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Join Date: Aug 2016
Posts: 38
If P trap in sink is full then the vent under the sink is probably bad. It keeps tank orders from entering the cabin while allowing air into the system to help the drains work .

It just screws off and can be purchased at Home depot or many other home imp. stores.
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