How do you replace toilet flush valve?

Take tank off of the bowl and replace it . Always install new tank to bowl bolts

and washers and tank to bowl gasket. The flush valve is what your tank ball

is conected too. If your talking about ballcock then you just take it out with out

having to do the above. The ballcock is what lets the water come into tank.

Always shut off water either way. If you cannot get the bolts to come lose you

will have to hack saw them off, it will take a little while to do so but it works best. You will only use the blade it self and turn the blade around. And you will

be cutting between tank and bowl and put something on the bowl so not to

scatch the bowl like Duct Tape or what ever you have like this. and if you have

a brass nut on flush valve under tank you will have to cut it also