u/James8x9

I think mine has pressure relief valve missing, want to figure out what it is for and how to install it? I am not sure is there is any other damage.

So if anyone can share a photo of the inside, specially focus on the relief valve part, would be greatly appreciated.

Last question, cai I just seal it with a nut/bolt set? I do not remember bromine produce gas when in water.

TIA