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Enrique is correct.
This port on the adapter is to allow air to blow across the front glass of the camera to allow use in long extended operation, and very humid conditions.
QHY also has pumps for this sort of work regarless of manufacturer.
Hey Enrique, you may want to blow up that rubber horsey from the swimming pool and place it in your observatory. With all that dew, your gear may float away..
Theo
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