American Standard033643-0070A Seat Disc Black, 3/4 in x 3 in, 1 Count (Pack of 1)

This seat disc fits well on my American Standard toilet. American Standard designed this part to enable anyone to change the part in just a matter of minutes so don't buy any imitations. And there's no need to call a plumber because anyone can install this very easily. I bought this from Amazon and they provide the product as described with reasonable price and I got this product by the anticipated date. Excellent product, excellent service.

OK, it is just a rubber disk but it solved my leaking American Standard old style one piece! I had bought three different whole valves --each with rubber disks that LOOKED like this but they all leaked, some a little, some a lot. I bought the red ones at the big box "HD" store. They leaked too. After a frustrating week of sealants and repeated swapping of parts I bought this one. This was apparently an OEM item made by or for American Standard and it just snapped on and worked PERFECTLY. Five Stars!Later addition: A year later I had the same problem again with another of the three American Standard model 4s in my old house. This time I knew not to go to the big store and I ordered the same again one on Amazon. Yikes! It didn't work this time.Since it was the same "OEM" replacement that had worked last time I was sure it had to be another problem, maybe the seal underneath the bronze base? So I took everything apart and added a good seal of plumber's putty between the base and the porcelain. Nope. STILL didn't work; toilet refilled every 15 minutes or so. Carefully observing the new flapper and the old pivot it appeared that the edge of the rubber disk touched the pivot just enough to push it slightly off center. I thought of just clipping one edge, but since the disk can turn, i figured I'd get the same problem again if it turned a bit. So I took kitchen shears and trimmed about a sixteenth or an eighth inch all around. VOILA!!! It worked instantly. Whether it is no longer touching the pivot mount or by snipping away some of the circumferential stiffening I made it more flexible, in any case it makes a great seal now.Whew. I had almost gotten to the point of buying a new toilet.

I noticed water coming slowly down the inside wall of the toilet. A leak like this can really raise your water bill, so I took off the tank cover and investigated. What i found was that rubber seal had hardened and needed to be replaced. To replace, I turned off the water to the tank, look for small valve under or behind tank. Once the water was turned off, then to replace seal, you gently pull off the old one (its a ball like joint), and replace it with the new one. Very straightforward, then turn on the water to insure everything is working, if everything is good, put cover back on. This is an excellent replacement..

Perfect fit and easy to install

On the advice of helpful forum and review posts, I decided to replace the disc with a new one hoping to stop a slow leak. The previous disc was less than 5yrs old and was an American Standard branded one. When I inspected it, it looked like what a 5yr old disc would look like, but didn't seem to be compromised in any way. I changed it thinking that if it didn't fix the problem, I would probably end up changing it out at some point anyways. To my surprise, just replacing this part with a new one solved my problem. Apparently as these discs age, the seal they form starts to deteriorate and leads to leaks. Anyways, it's worth a shot given it is low cost and may fix your problem too.