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Drain Box under Battery Tray ??

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    Drain Box under Battery Tray ??

    I was doing some cleanup work in my trunk today, 1987 325is, and I found a small square plastic box under the battery tray. It has a whole in the bottom that fits into the rubber grommett at the bottom of the well that drains to the outside and it had a small rubber hose attached to the top part of the box that's obviously a drain for something but the other end of the hose wasn't attached to anything. Does anyone know where the rubber hose is supposed to attach? Is this leftover as a drain that used to hook to a battery?

    #2
    I checked on realoem and couldn't find it.

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      #3
      Battery vent
      "I'd probably take the E30 M3 in this case just because I love that little car, and how tanky that inline 6 is." - thecj

      85 323i M TECH 1 S52 - ALPINEWEISS/SCHWARZE
      88 M3 - LACHSSILBER/SCHWARZE
      89 M3 - ALPINEWEISS II/M TECH CLOTH-ALCANTARA
      91 M TECHNIC CABRIO TURBO - MACAOBLAU/M TECH CLOTH-LEATHER

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        #4
        If that box is not connected to the battery, and the battery vents out liquid, does that aid corrosion and/or rust?
        1990 325i
        2004 330i Individual 6-speed
        sigpic


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          #5
          Shouldn't vent liquid, but gas from the battery does. And yes, it can help corrode that area. Make sure it's hooked up to your battery.
          Estoguy
          1986 BMW 325, Alpenweiss ~ "Elsa"

          Need a photographer, come visit my site: http://estoguy.wix.com/unique-perspectives

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