E53 left rear quarter has water...is there a drain?

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Hello: My daughter complained the music wasn't working in my 2001 E53. The head unit seemed OK, so I checked the amplifier in the left rear quarter panel. I found about 1 liter of water in the quarter panel and the bottom of the amplifier was sitting in the water.


I removed the amplifier and the bracket that holds the amplifier. After removing the water I noticed what looks like a drain plug/vavle in the bottom. I'm having a hard time identifying this part. Is there a drain in the quarter panel? If so, what is it called and/or would someone be able to post a part number.


The right quarter panel also has a small amount of water. However, I found only an open hole in the bottom. Previously I had covered this up with duct tape. If the drain plug/valve exists, I suppose one should be installed on this side too?


Thanks for your help!