So I was trying to fill the windshield washer fluid when I noticed all the liquid I pour in immediately leak out from underneath. Further investigation lead me to find a missing(?) rubber plug/grommet shown in the pictures below (It's where the new fluid gushes out when I fill from the top). Can anybody help me on what the part is actually called and where to obtain a replacement part? Can I just find something to plug it up in the mean time?

Thanks in advance!

RMEuropean or mymercedesparts will have the part.

Thanks! I'll have a look through for what they have. Do you or anybody know what that hole is supposed to be for by any chance?

This looks like it might be it: http://www.rmeuropean.com/Part-Numbe..._5C1313F8.aspx

I believe its for the winter package which would be for a heat element so your washer fluid doesnt freeze up.

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Ah I guess it was good that I didn't order that part yet. I placed a piece of duct tape over it as a temporary cover because it seems the pump is dead. The hot glue idea is a good idea I might try later on when I have to refill (if i am unable to locate the actual grommet of course).

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to anyone that is curious, the part no is # 110 987 0039

I have just checked on my car and am getting ready to replace.
The rubber washer is very difficult to fit in the hole.

Can anybody help?
Any suggestions to fit the rubber washer in the hole?

Freeze it overnight, it will shrink a bit, and quickly install?

I can try to freeze it but I didn't know freezing can shrink rubber. i'll give it a try

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