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Someone left the bath running... that's what the overflow drain is for http://www.freediyhomeimprovement.com/wp-content/uploads/2010/07/How-Bathtub-Works.jpg ht

• AjithAntony 10y ago
  Yeah, it looks like a pretty modern bathroom and tub. It certainly has an overflow drain. Edit: Two other notes. 1) The age is irrelevant, even some Victorian-era claw foot tub would have an overflow. 2) I can imagine a scenario where the drain itself is hairclogged at the tailpiece such that it is draining slower than the tub is filling, thus potential overflow. Edit: From Sharon's video, a trip-level stopper/overflow plate: https://youtu.be/CKuTdZ5T8Ao?t=138 https://youtu.be/CKuTdZ5T8Ao?t=138