Zenith carbs leaking this secondary fuel dummy inlet?

teahead

aka "Rob"
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Not my carb (my phone died to take a picture), but I have this extra inlet (on both carbs) below the regular inlet pointing downwards. It's missing on the below picture on an ebay carb that supposedly came on a CS.

But it's plugged by someone by some extra fuel line, so not used.

Anyone else has this on their Zenith carbs? Maybe used on Mercedes?
 

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61porsche

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It's

a return fuel line outlet. Used on the last version of the carb. Or so the lore goes. It is listed in literature.
 
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