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Connected Vents
While flushing the latrine makes a sink murmur, this is on the grounds that their channel pipes are associated. The water streaming in the latrine squander pipe makes a vacuum, and the latrine and sink vent both permit air in to balanced the weight. These normally interface with a typical vent, and when it's impeded, the vacuum can get air in through the sink trap. The murmuring sound you hear is air going through the water in the snare.

Toilet Sink Combo, Dec 29 2020 on hello.ouishare.net