Question about Kohler K-3386-0 Rialto one-piece round-front toilet with seat and left-hand

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Can i put a fluidmaster 400A in a Kohler Rialto

I'm trying to avoid calling my plumber by replacing my fill valve myself. However, I've got a Kohler Rialto which may or may not require a proprietary fill valve...does anyone out there have any experience with this one-piece toilet?

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  • Lexa Kandola Dec 05, 2012

    FYI: the Fluidmaster 400A It didn't fit in my Kohler Rialto, and the Korky fill valve I think will be too wide at the top because the tank tapers in. I found the correct fill valve on for $25 (free shipping).


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Save that valve... !
Use a fluidmaster (diaphram) part #242 as a replacement substitute!!
Easier than most pill bottles... !!!
(turn off the water)
The valve seems to be very thin plastic but mine lasted 20 years before needing a new diaphram. I cold hear the water going (seep. seep, seep))... and changed the flapper valve... Wrong!
I actually bought the new white plastic one to experiment on... but never got that far... Great price ($26) from Amzn (new spare... still in box)

The white VALVE (right) end of the 1068030 twists off easier ... over the top (clockwise: less than 1/8 turn... there is a little white lock bar on the very back that has to be pressed in to allow rotation).
Ignore the (blue) float lever... you wont be turning anything that far.
The expensive & unavailable KOHLER diaphram can be substituted with a $2 FLUIDMASTER #242 diaphram... available everywhere... Home Depot, ACE, General Plumbing Supply...
(Amazon = $4 +/- shipping, (local "dealer" had nothing in stock... of course)). ships for a whole lot more!
Sadly... THAT very SAME FLUIDMASTER #242 will also fit in the "Kohler 703" valve everybody seems to be throwing away (the easiest valve I have ever repaired).
The GRAY "703" valve seems to be very thin plastic but mine lasted 20 years before needing a new diaphram.
That is a hard twist 1/8 turn: counter-clockwise... same #242 diaphram... 5 minute job!
Six minutes if you hold a cup over the valve and rinse it out like you are supposed to do...

Posted on May 07, 2013

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Posted on Jan 02, 2017

  • 35 Answers

SOURCE: I can't unscrew the bolts on my Kohler 3386 rialto

There is clips where the bolts should be .Flip the clips up grab hold of the seat and pull it strait out towards the front of the toilet.

Posted on Dec 03, 2009

  • 20 Answers

SOURCE: Can't install new Kohler rialto Flush Value

Take your new gasket to a hardware store and try to find a thinner gasket.

Posted on Apr 29, 2010

  • 268 Answers

SOURCE: How do we replace the seat on a Kohler K-3386-0

Kohler will try to sell you $46 anchor bolt kit 84999 & also there special tool. You should expect that for a $400 toilet.

Try this instead:
1. Use 1/8" drill bit and drill and drill around the bolt until the anchor material can be removed.
2. Carefully clean hole with 11/32 drill to remove all remaining acchor material.
3. Go local hardware store & buy a 10 - 32 3/8"X3/4" rubber expansion plug (make certain threaded part is brass & has shoulder on 1 end), a 10 - 32X1.5" Phillips bolt and couple of small fender washers fit the seat.(about $4 for 2)
4. Assemble carefully not to over tighten and crack the porcelain.

Hope it helps

Posted on Oct 07, 2010

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1 Answer

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Take lid off and check that the fill tube is in place. If so flush with lid off to see were the water is squirting from, be prepared to clean up water...If you can, do a slight flush. If there is water coming from any where but the bottom of fill valve and the fill tube you may need to replace the fill valve. In my experience, the fill tube is dissconected.

For Diagram

Jul 06, 2010 | Kohler K-3386-0 Rialto one-piece...

2 Answers

Can't install new Kohler rialto Flush Value

First things first, remove the fill valve, and the flush handle mechanism. This will give you plenty of room to work with the flush valve. Before installing flush valve lubricate tabs with plumbers grease. Now put on a pair of work gloves, pushed down very hard and turn the tabs should slide easy because of the grease. Remember do not alter the gasket, the gasket needs to be compressed to do its job. I know removing the fill valve and the flush handle seems like a pain, but there is no way to get your hands in the proper position to install the flush valve assembly.

Apr 25, 2010 | Kohler K-3386-0 Rialto one-piece...

1 Answer

We replaced the toilet kit about 6 months ago and now the toilet runs even when the bowl is filled? What can we do to fix it.

There is either a screw on the top of the fluidmaster, or the float can be screwed out further. If it has a screw on top of the fluidmaster, screw it in to make the valve shut off earlier. Keep adjusting and flushing until it shuts off before it overflows. Hope this helps...

Oct 13, 2009 | Kohler K-3386-0 Rialto one-piece...

1 Answer

Valve adjustment

You need to replace the flapper and you will need to purchase one specifically for the Kohler toilet. I have the same toilet and tried using a generic flapper and from experiance, it didn't work until I bought the correct one and I'm a plumber! Have a great night.

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