[Atlas Sneezed]

Wouldn't a snake, especially a snake not particularly a water snake (a tree snake, for example), drown before going through the plumbing?

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Waste piping is not filled with water. It is empty, except for whatever waste is tricking through it. Like a roadside storm-sewer culvert.

The only thing that is filled with water is the trap.

[franksolich]

The only thing that is filled with water is the trap.

Oh. Thank you, sir; obviously waterworks are not my expertise; I thought the whole thing would be jammed with water.