Master bath toilet replaced with a Cimmeron class 6 confort height toilet. The master bath toilet backs up to the hall bath toilet - same wall. The hall toilet is very old. When the old toilet is flushed, water from the Cimmeron bowl flushes (leave the bowl) also. After 2 or 3 times flusing the old toilet, there is almost no water in the bowl of the Cimmeron. Called Kohler and they said they we probably need an off set Y - one higher than the other to fix the problem. Even if I switch out the old toilet for another Cimmeron, Kohler says that the problem will still exist. Does this sound right or is there another reason this may be happening?

check the overflow pipe in the cistern tank as some fill valves do not stop completely but allow input of water after the noise has stopped. This allows the water level to rise up and the water to flow out into the toilet bowl. Reduce the water level height by adjusting the cut off level and when the water rises past the new level the increase pressure on the valve will shut it off.

try running all the water in the whole house at once. all toilets. outside faucets, washing machine, ect...
assuming you have no leaks.

American standard cadet III is a nice flushing toilet that is reasonably priced. The tank is smaller than the cimarron. Toto also makes good flushing toilets that would fit your needs, but you will pay more for it too.

You may be experiencing what is commonly called "water hammer" from trapped air in the water lines. The most common way to eliminate a water hammer is to replenish all air chambers with air. You can't inspect them, so here is how you do it. Shut off your home's main water supply valve (usually located by the water meter inside the basement, or on the other side of the wall from the water meter if the meter is outside the house.) Next, open the nearest outside faucet to the water meter. Then open several of the inside faucets including the one in the Master Bath. Last, open the faucet that is at the lowest level of the property (usually the utility tub in the basement). Turn it on all the way to drain all the water from the pipes. As the water is drained from the pipes, it is automatically replaced by air, including the air chambers. The moment the water is completely drained from the piping the lowest faucet should be turned off and the main valve reopened. Aire will be pushed out of the horizontal and open vertical water lines and sputter as it exits the faucets inside and out. When all faucets are running smoothly, close them one by one from outside to inside, lowest to highest. In most cases, this should give you quiet running faucets.

Hello- If you replaced old ball and rod set with new fluidmasters they will most likely need to be adjusted, not all toilet tanks are of equal height. You will have to adjust water height,meaning you must keep water level below fill tube located in center of the toilet tank. Adjustment is done from bottom of the fluidmaster, they screw in and out to adjust height. You will notice threads along the bottom part of the fluid master, on the inside of the tank,they adjust up & down! Goodluck!

Gerber avalance is a great toilet if you can find, is ada 18'' with seat

I can't answer your question about the part from the #6 fitting the # 5 because I don't remember. I think it will but they were haveing trouble with the older one breaking down due to chlorine and other water treatment chemicals.I Thank you.

You gonna have to replace the whole fill valve mechanism. Go to the hardware store and get the Korky brand, because they work like a champ and they are super quiet. Don't buy Fluid Master because they clog easily and are junk. Learned that the hard way after having to 3/4 of them on a 42 unit apartment complex.

A fluid master should be universal and as long as it will allow the water to reach set mark on overflow pipe.

If this is a new development, then you have a partially clogged drain or maybe a crack in the bowl assembly. If the toilet always did this, then perhaps the drain pipe was not installed correctly.

I would remove the toilet and run a snake through to the main stack. If you find that is clear, check the bowl for cracks and check the tank water level to be sure that the tank is filling to the water line on the tank