Kohler GP83888 Gasket for Some Toilets

This is the seal for the flush valve housing. It is for single piece Kohler toilets. In particular, I used it on T33 UPC K3425. It stopped all the dripping and leaking which came from the old seal.The installation was not a breeze, I'm afraid. After removing the flash valve and the old seal, I had a difficult time reinstalling the flash valve as it attaches to the toilet tank against this new seal. I must have tried a dozen times. Eventually, I brute-forced it at the risk of breaking the flash valve clips, but it eventually worked. I will still give it five stars.

Large enough and thick enough to cover triangular hole in Koehler toilet.

This stopped my leak. Installing it wasn’t hard but cleaning out the tank on my Rosario toilet is a pain because of the way it’s designed. I wasn’t able to do a through job of getting all the water out and that’s why I expect this gasket to fail in about 20 months like the last one. It’s not exactly a fault of the gasket itself but an issue with the way the overall system was designed. Once the tank gets contaminated, it’s really hard to clean it out with the toilet in place.

Cheaper than replacing a toilet. Old gasket was hard and leaking. No problem now.

I have tried the universal brand even the supposedly ‘original’ part bought from Mercari. None works until I bought the original part from here. Lesson learned.

I ordered two (2) of these gaskets and both arrived separately. The packaging has the exact part number and was intact. Unfortunately, only one gasket was the correct size. It appears the manufacturer incorrectly packaged the gasket. The correct gasket (GP83888) is higher in height and smaller center circumference. Putting them next to each other is obvious one was incorrectly packaged.Amazon did allow us to replace the incorrect item and did not require me to return the incorrect gasket. I am awaiting the replacement gasket and hope it is the correct gasket in the packaging.Update: I received the replacement gasket and it is the wrong part inside the GP83888 packaging. I am returning it for a refund.

Maybe a bit old?

After some starts and stops with buying the incorrect parts that were recommended on Amazon, this was the right part to teplace the gasket an older Kohler Rialto toilet flapper assembly. This model needs a tapered gasket on one end and other gaskets I had purchased were not. I repaired two of these toilets using these gaskets. I used a clamp & 2 pieces of wood to compress 1 gasket and tossed it into the freezer per others recommendations and it went in a LITTLE easier than the one that was not frozen.