



🚽 Seal the deal with Kohler’s leak-proof gasket!
The Kohler GP83888 Gasket is a genuine Kohler-engineered flush valve seal designed to fit multiple Kohler toilet models. It ensures a secure, leak-proof connection between the flush valve and tank, restoring original performance and preventing water waste. Trusted by hundreds of users with a 4.3-star rating, this gasket promotes long-term durability and efficient toilet operation.



| Customer Reviews | 4.3 out of 5 stars 349 Reviews |
P**R
It worked with some effort
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.
M**.
Stopped a leak
This was what I needed to stop a leak in my Kohler one-piece Rialto toilet flush valve. Followed some tips after searching online (putting it in warm water to soften, and using a tennis ball to push down when installing) and it was easy to get in place.
C**R
Perfect fit
Fit perfectly for my Kohler 3402BP and it's triangle hole. I only gave 4 stars since there was black reside that came from the gasket when pressure was applied. Hard as hell to get off your hand.
D**W
Only original part works!
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.
L**A
Recomendado
Exelente marca
C**K
Wrong Gasket
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.
H**Y
Perfect fit for Kohler French curve
Cheaper than replacing a toilet. Old gasket was hard and leaking. No problem now.
N**F
Already falling apart?
Maybe a bit old?
Trustpilot
1 day ago
1 month ago