Kohler K83664 Flush Valve Kit

Lube with olive oil, worked perfectly.

Not as difficult to install as I was led to believe.Shut off water supply, flush, vac or sponge remaining water, take a before photo, unhook flapper chain from flush arm, remove old flapper, remove old unit by pushing down and turning clockwise 40 degrees, clean surface, remove new gasket and apply olive oil liberally to all sides of new gasket, reinstall new gasket, clean hands for firm grip, install new unit by pushing down and turning counterclockwise about 40 degrees, install flapper and chain, turn on water supply, fill tank and test.

Follow the instructions, particularly those on which side of the large sponge-like washer to have facing up. What is intuitive (or might be intuitive) relative to what you think is right for that washer is wrong. Then pay attention how to insert this assembly relative to the triad of spurs that hold it in place, the force to push it fully down (more force than you might think compressing that sponge-washer), and finally the clocking (rotating) to where it holds in place. Those little triangle feet and the compressed sponge-washer hold this puppy in place pretty firmly if you get it right. Obviously for it to end up in the right position after rotation you have to shove it in so that when you clock (rotate) it, it locks pointed in the desired position. Done properly what seems at the beginning like a mickey mouse attachment is actually fairly simple and strong design. Do not coat the sponge-washer with anything. Hint: In my opinion depending on your water type (mineral/chemical content) this sponge is only good for one go-round, do not try to reuse it. The plastic housing could last a lifetime, the flapper may need replacement at some point, but absolutely replace the sponge anytime you have had to handle, move, or remove this assembly. The sponge-washer works because of it's compression when new, but it tends to hold that compressed position and for that reason re-use is ill-advised.

I was unable to find the correct flapper for the Kohler3434. So had to buy the entire unit. Thank you to the poster who bought this entire unit to get the correct flapper. I tried the assortment on Amazon and none sealed properly.Unfortunately, my seal was about gone too. Fussy around in the tank caused it to leak. So it had to be replaced as well.It is a real pain in the old single-piece toilets. But it is possible.The two critical tips from other posters are1) Remove the old adhesive. Which is not supposed to be there!2) Coat the seal with vegetable oil. If not for this trick? I would be on to final tip 3.Still, it is difficult. Requires a great deal of even force. I scuffed my skin by applying enough pressure.3) Another poster compressed the seal between two boards using claps. Frooze it hard.Then let it thaw, re-expand, and seal.Having worked with this material? I think this approach would work. I might have tried it first. Once I knew what a pain this was going to be.Not sure about buying a Kohler again. This part should be on Amazon for the K3434.

Right fit for 3434bb; but spent 2 hrs for me to install; it is an old design, so for the first time user, watch videos before install, or find someone with the experience…

Needed to fix my mother in laws toilet, which had been running almsot continuously for weeks because my brother in law isn't handy.....neither is my husband! She has the k3434 Rosario toilet, can't find pieces in any old store (a reason I'll NEVER buy one of these fancy toilets for my own house). I didn't want to replace this whole assembly, her old flapper valve was all corroded and gross so I figured that's all we needed. I bought this whole thing In case I was wrong, since you can't just buy this anywhere. Well, flapper is all she needed, I popped the old one off, separated the new one and put it on the old fill tube and voila! Toilet works properly again. I'm keeping the new fill tube in case we need it later but hoping not. I also couldn't confirm whether this worked for the Rosario, so if that's your question you can know the flapper valve is definitely the same! I'm sire the rest is a match too. And I got a genuine Kohler part, too

Muy bien y de fácil instalación.

I thought I could install this myself but I had to get my brother-in-law to come over and do it because I was not strong enough. You have to push really hard down on the gasket (step 6) in the provided instructions (make sure the tapered edge of the gasket is facing the bottom (step 4), and I did not have the strength to do this. I am a 62 year old women.Another ‘pro’ tip— Kohler makes two flush value kits. K 83664 is for 2 inch gasket opening. There is another kit # for a 2.5 inch gasket opening. I learned the hard way and bought the larger kit the first time. So I had to reorder and buy the correct kit. Now where on the Kohler flush valve kit webpage does it make this distinction. You may have to pull out your flush valve, turn it over and measure the bottom because the gasket and the 3 pronged teeth have to be secure on the ceramic opening. I also used my old flapper with the new kit because the seal fit better and stopped the teeny, tiny trickle of water I was hearing after the water tank was filled with water.I would have rated this a 5 star, but because I could do this replacement myself and the kit debacle, that is why is gave it 3 stars.