I am doing a swap from a k8 to a KLDE with the ZE curved neck manifold. During part switching between the engines I came over this odd sort of vent or coupling from the ZE manifold.




As you can see, It's not on my k8 manifold.


Does anyone know what this is and more importanly what I should do about it?
I hope to get some answers cause I haven't bin able to find it by searching..