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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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