Specifically, an American Standard "Cadet" 4000 series. My model has the skirt all the way around the bottom for easy cleaning, but otherwise is like most other low flow (1.28 GPF) Cadets.
The flapper that came with the toilet is a Fluidmaster 540. The flapper itself is plastic, so the seal is just an opaque rubber-like ring that can be removed. These rings are notorious for developing water blisters, which is what mine did, and leaking would ensue, with the tank topping itself off perhaps every 30 minutes, if not more often.
I couldn't find either the ring or the entire Fluidmaster 540 assembly at two stores I tried, so I decided to go with a Korky 3060 universal fit flapper for 3" flush valves.
I'm glad I did. With the Korky, the bowl now flushes out completely instead of the half-flush I got with the Fuidmaster. The Korky is also silent. The Fluidmaster made a loud "thud" when it came down. I no longer need to hold the handle down to fully clear the bowl, perhaps not even for big jobs, but I'll know more about that tomorrow.
If you hate the half-flush BS as much as I do, the Korky universal fit flapper is the answer for A.S. Cadets, and possibly for other makes as well. It installs as easily as any flapper I've dealt with (there are adjustments to make prior to installation, which involve exposing or covering holes in the side of the flapper "bulb" -- covering them all is the setting for the Cadet and that makes all the difference), and it has a five year guarantee as opposed to one year with the American Standard/FM replacement.
After I had purchased the Korky, for the hell of it I checked on line to see what the correct Fluidmaster replacement would have cost. The price wasn't much different from the Korky. I also read the reviews on the Fluidmaster, and there were several complaints about blisters forming on the flapper ring. If you're careful, you can pop them with a pin on the top side, which will allow the ring to seal again. A free fix, but I'm far more pleased after installing the Korky.
If you have a low flow toilet with 3" valve and are disappointed with its performance, the Korky may be the answer. It fits quite a few different makes.
The linked site has a video that illustrates some of what I've described here.
The flapper that came with the toilet is a Fluidmaster 540. The flapper itself is plastic, so the seal is just an opaque rubber-like ring that can be removed. These rings are notorious for developing water blisters, which is what mine did, and leaking would ensue, with the tank topping itself off perhaps every 30 minutes, if not more often.
I couldn't find either the ring or the entire Fluidmaster 540 assembly at two stores I tried, so I decided to go with a Korky 3060 universal fit flapper for 3" flush valves.
I'm glad I did. With the Korky, the bowl now flushes out completely instead of the half-flush I got with the Fuidmaster. The Korky is also silent. The Fluidmaster made a loud "thud" when it came down. I no longer need to hold the handle down to fully clear the bowl, perhaps not even for big jobs, but I'll know more about that tomorrow.
If you hate the half-flush BS as much as I do, the Korky universal fit flapper is the answer for A.S. Cadets, and possibly for other makes as well. It installs as easily as any flapper I've dealt with (there are adjustments to make prior to installation, which involve exposing or covering holes in the side of the flapper "bulb" -- covering them all is the setting for the Cadet and that makes all the difference), and it has a five year guarantee as opposed to one year with the American Standard/FM replacement.
After I had purchased the Korky, for the hell of it I checked on line to see what the correct Fluidmaster replacement would have cost. The price wasn't much different from the Korky. I also read the reviews on the Fluidmaster, and there were several complaints about blisters forming on the flapper ring. If you're careful, you can pop them with a pin on the top side, which will allow the ring to seal again. A free fix, but I'm far more pleased after installing the Korky.
If you have a low flow toilet with 3" valve and are disappointed with its performance, the Korky may be the answer. It fits quite a few different makes.
The linked site has a video that illustrates some of what I've described here.

