Question about Kohler 3386-6 Rialto Skylight Round Front Toilet

2 Answers

Kohler Rialto flap valve leak

Kohler Rialto toilet model K3402BP
Manufactured 1989

I have replaced the flap valve numerous times with a 'Kohler' or generic flap valve. I have cleaned the flap valve seat to make sure it is smooth. I can effect a seal if I push down on the flap valve. I have added some weight to the valve to help it to seat and sometimes it works, sometimes it doesn't. I understand this is a common problem with this model. Kohler has suggested a kit for $126.00 to replace all the parts, but they don't have any because the manufacturer has gone out of business, or a new more water efficient toilet. Either option is considerable expense as I have two of these with the same problem. I would appreciate any help.

Thank you

Posted by on

  • 1 more comment 
  • shaggy calf Feb 23, 2009

    The bottom of the flap is not catching.

    Thanks for your help.

  • Anonymous Apr 13, 2009

    Guys I have the same frustrating problem witht the Kohler hinge flap. Whenever you flushed the flapper pulled to the left and wasn't completed seated. I bought a couple of different flappers (thinking there was a defect) and then started to research the problem a bit. However I figured out that I didn't have the flapper snapped into the ridged place holders in the back. You have to pull forward very hard and make sure that the rubber hinge is seated in the ridge. Once I did that, the flapper no longer pulled to the left when flushed. There are different heights of ridges. I snapped mine at the third ridge from the bottom. Hope this helps.

  • albert getty
    albert getty May 11, 2010

    is the bottom of the flap catching when it is closing?


2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has answered 20 questions.

  • Expert
  • 82 Answers

If the flappper isn't closing, there is no suction AKA a clog perhaps.

Posted on Sep 03, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 547 Answers

If so cut 1/4 inch off the bottom of round part of flat valve

Posted on Feb 23, 2009

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I have a Koehler model 703 84679aa. The seat bolt is loose and you cannot get to the but without pulling the toilet. Does anyone know how to tighten the seat without removing the whole toilet?

Kohler Rialto / San Raphael toilet problems # 84499 ...

? 13:04
Mar 31, 2012 - Uploaded by Dino Pinch best kohler rialto / san raphael toilet repair video on youtube. ...the kohler brand rialto model wisks away the offending lumps of ur behind product, never to be seen again. .... 'can't screw a lightbulb in'. .... How to Install Toilet Seat on Kohler One-piece ModelK3434 - Duration: 7:10. by emf4kv 20,891 views.

Jul 26, 2015 | Home

1 Answer

Can i put a fluidmaster 400A in a Kohler Rialto

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...

Dec 03, 2012 | Kohler K-3386-0 Rialto one-piece...

1 Answer

The toilet tank doesn't fill up properly. I have replaced the flap several times during the past 24 months. I have come to the conclusion that the whole flushing system has to be replaced with...

Kohler toliets can be a pain to repair. I have found with them that the only thing to do with them is go to a plumbing company, take the model number with you and replace all in the inner parts to it. You will replace the fill valve and flush valve. After I do this on Kohler I don't have anymore problems with them. It should work for you, just make sure they are Kohler parts. Good Luck

Tool Belt Diva

May 16, 2011 | Kohler Toilet - One Piece with Ingenium...

1 Answer

I have Kohler 3386-6 Rialto Skylight Round Front Toilet problem is that tank filling is very-very slow, perviously it used to fill in few seconds now it is taking 15 min. please let me know how can...

There is a screen @ the inlet to the vavle where the water connects that may be plugged or contact Kohler they will send you a repair kit for the fill valve.

Dec 12, 2010 | Kohler 3386-6 Rialto Skylight Round Front...

1 Answer

Kohler k-3574 float valve problem ,it dosn't shot off runs slowly all the time

There is two possible solution to this problem. Adjusting the float valve by turning the adjustment screw clockwise. If by adjusting the valve still does not shut the water of it is time to replace valve and according to your product make and model the Float Valve part number is 1083167 replaced by GP1083167. I hope this information helps. I also included a link to a website with the part so you could see the part and compare (this is only to view I don't promote any particular web site) you can probably find the part at local hardware store, plumbing shop, DIY store. Please rate info provided, Good Luck and have a great day.

Supply Float Valve Part GP1083167

Apr 04, 2010 | Kohler 3386-6 Rialto Skylight Round Front...

1 Answer

I can't unscrew the bolts on my Kohler 3386 rialto toilet to replace the toilet seat.

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.

Dec 03, 2009 | Kohler K-3386-0 Rialto one-piece...

1 Answer

Water running off and on and comes out from top piece.

you unfortunately need a new fill valve. I say unfortunately because they are expensive, (about $120), for that model and not everywhere sells them. It it was a "regular" toilet, the part would be a any home store and cost about $10. Sorry to be the bearer of bad news. How old is the toilet? You may consider replacing the whole thing.

Aug 10, 2009 | Kohler 3386-6 Rialto Skylight Round Front...

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.

Apr 01, 2009 | Kohler 3386-6 Rialto Skylight Round Front...

Not finding what you are looking for?
Kohler 3386-6 Rialto Skylight Round Front Toilet Logo

1,563 people viewed this question

Ask a Question

Usually answered in minutes!

Top Kohler Home Experts

Donni Steen

Level 3 Expert

659 Answers

john h

Level 3 Expert

9076 Answers

Tim Whalen

Level 3 Expert

3072 Answers

Are you a Kohler Home Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides