odd issue

[JimRam50]

My 1981 D50 has a missing part between carburator and manifold. I suspect it is some kind of vacuum device. I have attached a photo. Any ideas?
I have tried posting this 2 different times but I can never find it after I post it:

[irotagrup]

I can look at my 82, and see if I can't get a picture of it if that will help.

[JimRam50]

Ok and thanks

[irotagrup]

Hope this helps.