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10 Mercedes e350, 09 Mercedes GL450, 95 BMW 325IC, 89 Mercedes 260E, 84 Euro Mercedes 300D 4spd
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645 Posts
Do you have part number?
Or picture would help.
 

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W221 & Audio Moderator
2013 S550
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10,978 Posts
If it looks like the device at the upper right in either picture, it is the PSE pump for soft-close and lumbar support. Pic on the left is from an '05 W220, and on the right, a '00.
 

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