Those of you that collect or run McCoy know the steam chests are a constant issue due to zinc rot. I have one loco that has all of the steam chest in powder form. This past weekend I picked up a TCA loco, tender and 5 cars. The steam chest is cracking, but still intact, except for the front chrome covers which were missing. I found a 7/8" chrome tube plug from Ace Hardware does a nice stand in job until I can acquire a complete set of steam chests. I am also going to tinker with using a 3/4 copper pipe coupler and these caps to make a new set of steam chests, but that is down stream. I'd rather have ones the look correct, but this will work for now.
Steve