Fast shipping and as described

I wish they had the 3 bolts as part of the package, otherwise I had to buy them separately.

OK, this is not an exciting product but it does the job it was designed to do. I got tired of NOT getting a call back from the plumber so I decided to fix my Kohler Wellworth toilet myself.

Online research told me that some Kohlers use this annoying proprietary triangle shaped gasket design. Double check yours before you order. Does it use three brass bolts? Odds are it uses the Kohler triangle gasket.

Okay, the kit comes with the flush valve assembly and all its parts EXCEPT the three required brass tank-to-bowl bolts. You'll need three (with washers and nuts). Get them at a plumbing supply place pros use. Do NOT get them at home depot because the "brass" bolts HD tries to sell you are not brass at all. They are brass coated steel. Take a magnet with you to the store and make sure you are getting 100% brass bolts and nuts and non-magnetic (aluminum) washers. This is to keep any of those parts from rusting up on you.

First turn off the water and empty and disconnect the tank and bowl. Put the tank down on a soft rug or towel. Make a note of the orientation of the old flush valve stack. Take the old flush valve assembly out.

OK, there are no instructions in the new kit but the order of assembly is:
1) the flush valve stack goes in the tank and through the hole
2) the triangle gasket goes on the outside of the tank with the three rubber "feet" poking through the bolt holes.
3) the big plastic washer goes next,
4) and THEN the big plastic nut

Orient the flush valve stack in the same way the old one was. It is a pain to tighten the nut because the gasket gets in the way, but do your best not to mar up the threads. Use the biggest pair of slip jaw pliers you can find or borrow.

Then the brass bolts slide in from the top. You do NOT need extra rubber washers. The only good thing about the triangle gasket design is that the rubber "feet" on the gasket compress under the bolt heads to form their own washers.

Put the tank back on the bowl, bolts through the holes, washers, then nuts. Slowly and evenly tighten all three brass bolts until snug. Don't overtighten or you might crack the porcelain. How do you know how tight is too tight? You don't really. Snug all three down until the rubber feet are smushed into the tank like washers and keep your fingers crossed that you don't hear a crack.

Put the water line back on the tank. Pour some water in the bowl using a bucket and see if you get any leaks. Leave it for awhile just to be sure. Once you are sure it doesn't leak turn the water line back on.

Mine worked on the first try.

I bought two kits for my Kohler toilets from Amazon and both worked out well. The actual valve system is from Fluidmaster and you can get that from Home Depot or Lowes. However, the rubber washer is what makes this kit unique. Keep in mind that Kohler toilet tanks have three bolts holding them down, instead of the normal two, and so you will have to use this triangular rubber washer/gasket to seat the tank properly on the toilet. BTW, this triangular washer/gasket can also be purchased separately from Lowes for around $12, but I decided to get the whole kit and caboodle from Amazon. The kit is good and everything worked out really well. The only gripe I have is that the kit does not include the brass bolts, stainless steel washers and nuts. I had to buy these separately from Lowes. Given the high price of the kit, I would expect it to include the three bolts/washers/nuts as well.

If you're doing this repair you should also be sure to get the bolt kit. from Kohler as well. Only after having had this flush valve shipped same day did I find that it didn't come with bolts. It really should be included with this because in order to install this part you have to take the tank off by removing the existing bolts and bushings. Fortunately we waited to do the job until we had the ordered bolts as one of the old bolts had to be cut off. As for the part itself and Amazon they were both great and delivered as promised.