It may work as a filter but I don't know because it failed less than 2 months after installation. On a 2004 Audi A4 on the B6 platform, part of the fuel regulator failed and gas entered the breather hose. This caused a starting problem, so it will give a warning that you should check this hose if you recently bought this hose. For another $20, find German-made OEMs at Revain. This is a part I wouldn't skimp on as it's not just one car part, it's two in one, thanks VW/Audi. Lesson learned.
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