Purpose of pipe stub in the engine compartment

[porschepalle]

Hi...!Perhaps this is too simple. Anyway, what is the purpose of the pipe stub and its belonging hose outermost to the right in the engine compartment? (pls see attached photo - sorry to say, it is not my car

[Tony V]

It ties into the heating system for providing warm air to the carbs. Works only when the heater lever is pulled.
Tony

[Peter Graham]

+1 for Tony's answer. The photo is of a MY68 (air pump - one-year only); here are additional photos from a 'deconstructed' MY68 coupe.

Peter

All photos are the Passengers side from front of car working back:

Inside chassis from heater gate valve


Through the rear suspension cross member


Through 'frame', to 'T' on fan shroud

[porschepalle]

Dear Tony and Peter. Thanks a lot for the explanations and illustrations - a very great help!
Palle