The 3402 requires several flushes, I adjusted input valve and ball float but still poor but not running (1st flapper bought from Kohler) would not seal so put old one in again.

How old is the toilet? Tom

Please define (several flushes). Does the toilet flush good when you hold the toilet handle down until the whole tank drains? Lee

HI Tom Thanks the house is was built in 1993 The toilet is a Kohler model 3402 one piece and worked until I adjusted in Canada the plumber said the parts weren't available but got the flapper in Seattle and the parts inside the fill valve ? But since replacing can only adjust the tank level to make any difference?

I have one that most repair plumbers miss.. Look down at the bottom of the bowl. If there is a small hole, then that is a jet that starts the syphon action. If it's clogged the water will just swirl around and slowly go down leaving solids behind. Take your finger,(UGH! ) and run it around the inside of the opening. Over the years minerals build up and cut down on the syphon (flush) action. If it is rough or you feel build up, take a table knife and put a bend in it to get around the curve in the bowl and chip and scrap it clear. Next take a coathanger and clear out the holes around the rim. They start the swirling action. And last, check the water level in the tank. It should be 1/2" below the top of the over flow tube. And speaking of the overflow tube, Make sure the small 1/8" tube from the ballcock to the white overflow tube is connected so it discharges in it and that it's flowing when the ballcock fills. This is what raises the water level in the bowl. For a good solid flush they all have to work together. Hope this helps and thank you for rating my reply.. Tom

Hi, Johnny: it is Kohler Rialto K-3402 toilet aka Low-Boy. It was the true low-boy toilet on market. Used to be very popular. First, something about the toilet itself...

I am sorry to say, it was the worst toilet Kohler has ever made. Kohler "happily" discontinued its production in around 1991-2. Then, they dropped the price from $350.00 to $99.00 to get rid of the rest of the stock. The toilet looked good but has never worked well.

The problem with Rialto toilets seemed to be that the water gravity was too low unable to develop enough flow to start the required swirling action. As result, they used to clog a lot.

Rialto uses one particular flopper. Its Kohler Model Number is: 83064. Any other flopper will not work (... as least as I know ). Also, any other replacement part is very expensive. The fill valve only will run you little over $100.00.

What we used to do is that we used to retrofit these toilets with 1B1X fill valve. It costs about $10.00 and works perfectly. They even supply conversion tube for bowl refill line. ( Kohler uses 1/2" OD rather than typical 1/4" fill line ). However, unless some third party company came up with their own version of Rialto flopper that works - you will have to order it from Kohler.

Your flushing problem may be caused by clogged waste pipe at closet ring. Also you may have some obstruction within the bowl itself. If the flushed water doesn't exit bowl easily, it will show as slow, lazy, swirl. Take 5' auger snake and snake it well. Also, Tom had very good advice.

If I am not mistaken, you can still buy them today - but only with Sloan Turbo Flush tank. Not with gravity gravity flush tank anymore.

Good luck... Milo

Hi, Johnny: it is Kohler Rialto K-3402 toilet aka Low-Boy. It was the true low-boy toilet on market. Used to be very popular.

But, I am sorry to say, it was the worst toilet Kohler has ever made. Kohler "happily" discontinued its production in around 1991-2. Then, they dropped the price from $350.00 to $99.00 to get rid of the rest of the stock. The toilet looked good but has never worked well.

The problem with Rialto toilets seemed to be that the water gravity was too low unable to develop enough flow to start the required swirling action. As result, they used to clog a lot.

Rialto uses one particular flopper. Its Kohler Model Number is: 83064. Any other flopper will not work ( ...as least as I know ). Also, any other replacement part is very expensive. The fill valve only will run you little over $100.00.

These were truly a badly designed toilet (remember the Pillow Talk, Milo?).

All of the parts to rebuild these can be purchased at Fergusons or Kohler directly, although it'll likely be a special order item.

Kohler did later update the parts to include a taller tubed flush valve and replaced the foam washer used to seal the flush valve with a more durable rubber washer, but rebuilding these toilets (all of Kohlers low boy models of that era) are still hardly worth the time, money or effort.