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Is this a check valve that goes to the atmosphere? The location is at the back of the intake manifold next to the EGR.

Is there any reason to replace it? The truck has 70k miles.

I am putting a 99 ML430 together but I did not take it apart!

Thank you.
 

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If it is not cracked and holds vacuum, then it does not need to be replaced.
 

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Is this a check valve that goes to the atmosphere? The location is at the back of the intake manifold next to the EGR.

Is there any reason to replace it? The truck has 70k miles.

I am putting a 99 ML430 together but I did not take it apart!

Thank you.
It is not a check valve. It's a vent for EGR switchover valve. It does not hold vacuum. Piece of foam inside keeps junk from entering.
 
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