Old compression tank into two port buffer

After I removed the old head banger gravity piping, I had this compression tank left over and it felt wrong to scrap it.

I've been meaning to do something with it and finally got it installed as a buffer on my A2WHP. It is running as a two port series buffer (volumizer) on the primary loop essentially adding a bit of extra heat capacity to it. I ended up welding a port to the top of the tank to allow me to bleed the trapped air.

It works pretty well for that, about halved the cycles during the shoulder season from about 2 cycles/hour to one. Hard to say if it makes a difference in COP, energy use around this time is too low, but definitely not hurting things as there is no mixing.