Garage sale find

Yeah, didn't think it was bad for the price, went to their site and it seems that it sold for around $600 as of 2003. BUt couldn't find anything on a liner. Sent themn an e-mail so hopefully I will hear back from them.. Plus i think I will check with some of the local welding suppliers.

It seems to be blocked for some reason. Have taken it out of the machine and tried to feed wire through it and still nothing.