Had this for months and just installed it. I’m very pleased, fits my American Standard toilet. At first it didn’t and I was upset, but there’s a little nub on the underside of the flapper that you can pull out of the little hole and rotate the top of the flapper to adjust the height of the flapper. I had to lower the height of the flapper to fit over the hole. Once I made that adjustment, it fit perfectly. Worth the value and great to not have to hold the handle down anymore!! Instructions about the adjustment feature should be provided for us non-plumbers like myself. I got lucky and figured it out, but someone else might not.