New Vaillant EcoTec 836, slight leak underneath, what is this connector for?

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Discuss New Vaillant EcoTec 836, slight leak underneath, what is this connector for? in the Central Heating Forum area at PlumbersForums.net

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Got a replacement combination boiler, less that 1 year old.

Noticed some water from the connection pictured. Can't see what is it from the manuals, possibly a rainwater drain?

Was told by the person from Vaillant that it was an A A V (auto air vent), but she didn't sound too certain!

Can anyone tell me from the pics what that plastic connector under the boiler is actually for and should it be connected to the drain if it's likely to let out water once in a while?

Thanks in advance.
 

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Would ask for a warranty visit to check if it is supposed to drip it needs a catchment device as that’s a bad design just to let it drip on the floor etc
 

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