Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Has anyone seen this before?
I saw this today and it looked to be one of the old steel compression tanks. But after closer inspection i noticed that the supply and return piping for the boiler and the system branch off of it. It also has a tapping for the make up water and a manual key bleeder on each side. My thoughts are that its a combination expansion/air separation component. or maybe a buffer tank. I didn't see any additional expansion tank anywhere on the system so I imagine that expansion is one purpose it serves. Tried finding it online but had no luck. If anyone has any experience with one of these I would love some more information. I've inuded two pictures. Thanks.