Tool for remove a one piece toilet flush valve

link copy and paste
scroll down for TOOL
https://www.plumbingsupply.com/eljertoiletparts-canterbury.html

The flapper at the bottom of the tank is leaking and needs replacement.

either the fill valve is running and water is draining into the bowl via the overflow tube in the tank or the flapper is bad (or foreign matter) and it is allowing water to escape into the bowl through the flush valve slowly...causing the tank to drain and the fill valve to run every few minutes or so. start by inspecting/cleaning or replacing the flapper and hopefully that will do it because a one piece toilet flush valve needs a special wrench,to remove it, that you use with a ratchet. If you buy a new flush valve, it comes with the wrench (glorified piece of plastic) and is not too difficult to get the flush valve out. you can get a replacement at http://www.plumbingpartsdepot.com/ They do mail order, too. All you need is the toilet type - a four digit number embossed in the tank starting with a 2. hope this helps but if you need anything else just ask:)

ok, this sounds like a float or valve issue, should be an easy fix. you can adjust the float or just replace it with the one piece type. you may not be able to adjust it and get it to work, so I think the best thing to do is just replace the whole float assembly. About ten dollars or so at home depot or someplace like that. Turn off the supply valve, flush the toilet,and drain the tank by removing the plastic nut underneath on the left side. Drain the remaining water into a bowl. There is also a nut on the supply line that will need to be removed first. When you remove the nut that is flush with the bottom of the tank that also holds the valve in place inside. Take off the rubber hose inside the tank and remove the entire float and valve. The new one piece will have a adjustment for the tank level by just turning the entire unit. Make sure you put the rubber washer that is supplied with it on the bottom and put it back into the tank and tighten from the bottom with the new plastic nut. Make sure the valve inside is pointed at the plastic tube and re-attach the rubber hose. Then attach the supply line, tight, but not with a tool, just your hand. Turn on the supply valve, re-fill the tank, flush, and check for leaks. Remember, buy the one piece type, should be a gray valve with a black float built right on it. Good luck

The top of the pipe above the flush valve is threaded if you unscrew this you will be able to remove the flush valve and replace the gasket. I am assuming we are talking about the same here is a link that has all the parts:

http://www.plumbingsupply.com/kohlertoiletparts-santarosa.html

Remove the tank. Remove the flush valve and replace with a new flush valve kit. May need to change tank seal also.

The top of the pipe above the flush valve is threaded. Unscrew it, and you will be able to remove the flush valve and replace the gasket.

I had the same problem and contacted Eljer and they sent me the above instructions to make a tool to remove the flush valve.

Hi
try to increase the amount of water for each flush .

it is all one piece,replace it with the same model. a plumbing supply house is the only place you will find what you need.