that is a one-way valve with a broken of vacuum port
should be replaced with a new one , if you are not using the vacuumport. then cap it
looking for a bit of info if possible? Just bought a Caddy with a G60 conversion in it, I noticed this black piece of plastic had some electrical tape round it, took it off and there's a small hole there that's blowing out air, so a couple of questions.
1. what is this?
2. should it be blanked off or should it be piped up and running somewhere?
Any help would be greatly appreciated!
Thanks in advance