Hi, I just acquired 2 10 gal firestone kegs. they have the old style posts that need the plastic spacer underneath. Replacing those and the poppets are not an issue. The issue is that is has a round lid, not oval, not race track. the lid screws on and has a 1/4" threaded post that stick up through the lid which is two pieces with an o ring sandwiched in between, you tighten a wingnut to tighten the two parts together and squish the o ring which seals on the lip of the keg. it does seem to hold pressure but its not a standard corny o ring its smaller and much softer. anyone seem one like it or know where to get parts? the lid does not contain a pressure relief. the pressure relief is on the keg itself so I know its a pressure tank, its says nothing but firestone on it no other markings. and for the pics, and it did small like soda so I dont think it was for any kind of chemical tank