Sewer Caps

I have an issue in my basement where I smell a faint odor of sewage. I found it to be coming from my sewer caps. The caps are so rusted that the they can’t be threaded back on. I was told to get some 4″ lead caps and bang them into place. My question is whether or not this is a good idea and if so, where do I get them and what are they called?

Additionally, I was told to replace the cover of the whole area (it’s sunk into the ground about 12 inches with a lip to hold the cover) with something other than the piece of plywood that is there currently with something sturdier like a metal hatch of sorts. Any ideas of what should be used for this and where to go get it?

Thanks for your help.

By pwhite |