Kohler K1078578 Flush Valve Assembly Kit

Instructions to recommend wetting the o-ring gasket and I soaked it underwater for 10 or so mins as another reviewer recommended. That certainly helps but it does indeed still take significant pulling force towards the “front” wall to get the three plastic teeth seated deep enough to allow then turning it into place. The three plastic teeth are fairly robust but it is a bit of an anxious moment when pulling hard and turning the smaller plastic bits into place against the unforgiving porcelain. I found it helpful to (without the seal) mark in pencil on the “back” wall the exact angle position of the piece where the three teeth perfectly align with the three areas that accommodate the teeth, so I knew it was in the best position when pulling hard with the gasket on. Can see why the clamp squish and freeze method would be helpful to eliminate the need to pull hard while installing. Works well when installed. OEM kohler box and parts. Good that Kohler moved away from using this part in subsequent models. It’s a relatively unique plastic part not available in local hardware stores and when your old part breaks (the plastic teeth on my 23 year old original part broke while I was trying to replace the flapper) you want the most essential parts of your toilet that occasionally need replacing to be parts that are available ASAP in local stores.

This worked but it was way to hard to install. The gasket is too thick. I had to clamp the gasket between two boards and freeze it. Then I installed it while it was still frozen and squished down. It expands and seals in a few minutes.

Todo bien, le quedó perfecto

Fits perfectly and it does the job.

muy bueno