Oil bath air filter breather question

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Well-known member
Apr 12, 2011
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Canvey Island, Essex, UK
Ok simple question, on a standard setup for a 1969 twinport engine with a standard oil filled air filter there are two large breather outlets on the air filter body.

Obviously one goes to the breather next to the oil filler but which one ? The top one on the air filter or the bottom?

This leads to another question as to what the remaining large outlet in the filter is for and what attaches to it.

Has anyone got a nice clear picture or diagram they could share ?

Thanks in advance !

The AE-Series (North America) & AD-Series (elsewhere), VW 1600 Type 2 twin-port engines, were not introduced until the 1971 model-year.

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