Can someone identify this filler cap ? - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 09-22-2010, 09:16 PM Thread Starter
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Can someone identify this filler cap ?


I have this expansion tank filler cap of W140 S500.

Part number #A 000 501 82 15

How many O ring should be attach with the filler cap ?

Mine came with only 1 " O " shaped O ring. And the O ring is quite loose not fit.

Someone told me it should be the square type O ring.

Exactly what kind of O ring should fit in it and how many ?

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post #2 of 3 (permalink) Old 09-23-2010, 07:59 AM
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Can't figure out what cap model it is, but caps work with compressed gaskets, so oring, or square -both will work if they are correct thickness. You should have only 1 oring for sealing the cap on the pipe, but the cap might have pressure valve build in it with more parts.
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post #3 of 3 (permalink) Old 09-23-2010, 09:29 AM
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If you live in USA you can look it up yourself here:

Kent Christensen
'07 GL320CDI
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