I have recently fitted a new carb on my car (all working OK) but I am curios to know what this inlet/outlet is for. I have pushed a probe up inside but it just hits a blank, so I'm not sure if it actually does anything.
Can anyone enlighten me please?
![[Linked Image]](https://www.tm-img.com/images/2020/04/09/New-DGV-1.md.jpg)