Description Kohler 1039861 Memoirs 3.1-inch Toilet Flush Valve Upgrade by NuFlush Kohler Santa Rosa Flush Valve for One-Piece Models # K-3810, K-3811, & K-10491-0 Designed to replace the Kohler Memoirs 3-inch Flush Valve (not for Memoirs 2-inch) Part number 1039861 Exact size 3.07-inches Made to replace the Kohler Valve for a Total Upgrade Fill your tank to maximum capacity and get a Stronger Flush Every Time Video for Kohler Memoirs