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Old 03-23-2003, 11:10 AM
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Until recently, I've bought my filters from MB dealers. They always seemed to be made by Mann.

I recently bought filters from a supplier used by a lot of MB Club members. I bought one Knecht and one Bosch. The Bosch was identical to the Mann filters I had been using and it was BIGGER than the Knecht. The Knecht has 6 smaller holes and the Mann/Bosch have 4 larger holes.

Back to my original question, I wonder if the check valve is actually in the filter mount rather than the filter.

That's why I posted this question.
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