Thanks, Erik. Actually, it seems that the only replacement part is the Fluidmaster flapper and seat. There are two problems now besides the loose flapper/seat (which I should easily be able to redo.)

First, the stopcock valve leaks slightly unless the floatball is really pulled up. I know that I can adjust the pressure on the valve by changing the length of the floatball rod, but I still can't reliably get the valve to completely close. I assume that there's some kind of rubber washer in the stopcock which I could find at a plumbing supply store. Yes?

Second, the brass mechanism behind the flush handle is loose and flops around. This mechanism has a kind of rocker arm which allows the handle to be turned in either direction (from six o'clock position) to pull up the flapper via the lever and chain. There's a large nut that needs to be turned in order to tighten the mechanism on the porcelain wall, but I can't seem to get to it with removing a brass screw at the back end of the mechanism which is frozen. Is there a tried-and-true method for loosening these things? I've got WD-40 soaking in there and am thinking of buying a small propane torch to heat up the assembly. Any ideas?

Lonny, no markings found inside the tank besides the name "Standard."

Eric, Thank you for identifying the toilet. As soon as marc said he had a wall hung with a top fill water line, I thought.......

How did you identify that it has an offset flush ell? I have not seen a porcelain sleeve on the bottom of a tank.

Marc you should be careful with the torch. Heat may break your ceramic. And you should be able to get a washer from your hardware store. It will also probably have a leather or o ring around the stem to replace.

The porcelain is a "shroud" to cover the chrome-plated ell/offset....very common in older units. Marc do yourself a favor and hire a professional, these units are difficult to work on....use the terminology in selecting your plumber, if he doesnt know what the parts are by the terms given, look elsewhere. erik

They must be common in only some areas. I've not seen one if I understand the description accurately and that is that the chromed flush ell is covered by porcelain.

These are common in houses 70 years or older in all parts of the country......erik

Fixing a toilet can conserve water and save you money. Fixing an older toilet can be a nightmare and they waste 100's of gallons of water a day. I got a Fluidmaster 400AK from Aruntx.com Online Store. They are very helpful and shipped very quickly.

Aruntx.com Online Shopping has a video presentation about installing the Fluidmaster 400AK and complete instructions for available to view. For under $20 this is one of the best investments I ever have made, I have saved about $400 by installing this complete toilet repair kit. Hope this information helps.

mandingo your intentions are good but your experience is clearly limited.....this kind of product will not work on this type of toilet......poor advice is more harmful than no advice. erik