Put simply how do I remove this flush valve I have pictured please. It is rigid and I have tried to remove it the only way I know how, but it is so reluctant to move from it's cradle and space is really lacking to get a turn on it I fear I may break it. Help, some kind person in the know answer this for me please, for I understand that this unit can be simply replaced with another one without major dismantling. If anyone knows the make and model of this unit, it would help me considerably in getting a new one.
