Good morning, I'm going through an older AQ120B and was hoping someone could identify what this odd little nipple is that I found at the back right of the block. It looks like it goes into the oil system but was completely plugged up. I'm not sure if it's some previous owner's strange little project and it can be blocked off or if it should be connecting to something. So far I haven't been able to find any clear images on the web to show it or the port it goes into.
Any help would be appreciated!
Any help would be appreciated!