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 - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
... [Read Article]
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