Wouldn’t that make impossible for “pigs” to go trough resist flow, make cavitation acumulate grime and other piping problems?
Surely they have a reason to be but I have no idea what it is
In: Engineering
What you describe sounds like a water trap. Every sewage pipe have a water trap before it is exposed to the inside of a house. As the name suggest these trap water so that there is no contact between the air in the sewage pipe and the air in the living space. This ensures that the smelly gasses from the sewage will not seep into the living space and make it smell like sewage. These water traps is usually detachable so that if you need to maintain the sewage line you can remove the water trap.
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