As others have said, it is lack of venting, but it can be due to different causes. While any drains within 4 feet of the toilet will vent easily through the main stack vent, kitchen vents will often be further away and need a separate vent stack up through the roof. In order to allow for more flexibility of fixture placement "back vents" are often used. These will extend upward in the wall to a height above the fixture drain and then horizontally to a main "through-the-roof" vent stack. Vents have no water flowing through them so they are not subject to plugging except by rare situations like frost build-up or birds or wasps etc. Sometimes where a back vent is needed it is not installed. retrofitting can be difficult but there is an option in the form of a "closet vent" or "vent check" which is installed under the sink by teeing off from the drain pipe. It has a light spring which keeps t closed until there is water trying to go down the drain.
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Today's Featured Article - A Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
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