OM651 part/tube identification

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Mar 24, 2025 | 06:02 AM
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After rocker cover replacement by a shop, I can see there is a holder for a tube on top of the cover. But no tube is attached.
What is supposed to reside there?

Ilustrative picture of the tube:

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Mar 24, 2025 | 02:48 PM
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it could be the brake serbo vacuum pipe in right-hand drive cars
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