HomeBrewer did pass the time by typing:
Is there a rubber o ring or something that goes in the block where the
> dipstick tube enters on a 304? I just ordered and installed the dipstick
> tube - it didn't come with a seal or anything. Where can I get one if
> required? Would the standard autozone have it or maybe the dealer?
Nope, it's a press/friction fit.
It will go in easier if you put the tube in the freezer for a half hour or so.