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Sep 21, 2020 at 17:31 comment added J... The reason that they're illegal is that the shallow weir dries up quickly (in as little as a few days) and the trap fails when that happens. A proper p-trap takes 4-6 months to dry out, by contrast. If OP has such a trap and it's connected to the sewer and they don't want to remove it right away, it would be important to at least throw a bit of water into it every few days to keep the trap sealed.
Sep 21, 2020 at 0:55 comment added Ecnerwal In fact, a proper P-Trap floor drain (with the trap and a cleanout built in) gets the drain line higher than these do unless you double-trap them (also illegal under IPC and most [all?] other codes)
Sep 20, 2020 at 23:27 comment added Hot Licks As to why it was installed, it's likely because of it's minimal depth, meaning that there was less need to excavate, and possibly the drain line could have been placed higher.
Sep 20, 2020 at 15:57 history edited Ecnerwal CC BY-SA 4.0
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Sep 20, 2020 at 15:45 history answered Ecnerwal CC BY-SA 4.0