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fanny trap
Hahaha, something like of these? [edit: should have refreshed—probably not quite, although this one is kind of vaguely sinilar]
An in-line fanny trap would / might suffice (although I'm not sure if building regs actually allow it).
What @chiroshi wrote. With a fanny trap to stop the smells.
(* For the life of me, I can't remember what they are actually called in the shops)