KohlerK-86972 Flush Valve Assembly Kit

I bought the part for my toilet tank. The water was constantly dripping. Whatever I did, I was not able to replace the part. I turned to YouTube and the suggested to remove the gasket flatten it between two boards with clamps, put it in the freezer overnight. Put the flatten gasket on the part and installed it in seconds. That process should be included in the install directions. Otherwise the part was great.

Extermely hard to install.

Please read the other reviews. The comments about freezing the gasket between two pieces of boards is a must. You cannot put enough pressure on the unit to get it to Mount without doing so. I only froze it for one hour versus the 24 hours that others said. Once that was done it attached with ease.

Is there anyone can explain the difference between Kohler 86972 and K1078578? I just found the different marks of water level, and weights?

After 22 years my old gasket was leaking. I read the other reviews that described the installation tricks and now I have a working toilet.After I opened the box I took off the gasket and placed it between two pieces of wood. Then I clamped the pieces together until the gasket was about 1/2 as thick. Then I placed that in the freezer for a couple of hours at least. While I waited I test fit the valve assembly and found that when turned about 45 degrees (away from the float valve) it slid into the hole without any trouble with the 3 tabs.When the freezing time was over I quickly brought the clamped wood to the toilet area, removed the gasket, slid it back onto the valve assembly, and inserted it into the toilet. It took some hand pressure to get it in far enough to turn but not enough to require any tool leverage. Then I turned it upright and let the gasket thaw for an hour. That made the assembly feel solidly in place, so I hooked up the chain, turned on the water, and tested it. Everything worked fine.