Mansfield 630-0207 & Kohler 1078441 3 inch Flapper Replacement by NuFlush. Has a Solid 3 inch rubberized silicone Flapper, 3 inch Kohler & Mansfield 3 inch Class 5 Flapper. Fits most 3 inch Flush Hole Toilets, has a perfect fit with No Seepage or Leaks.