No, basically toilet flapper the float connected to the actual flapper. hole drilled out of the bottom of the tank big enough for the whole toilet flapper assembly to fit in....when the water level in the surge tank fill up it lifted the float which lifted the flapper which dump/flushed the the water into the dt tank ...tuning involved adjusting float hight amount of water going into the surge tank the depth of the pipe going into the dt tank also removing j tube from overflow to handle the 10+ gal of water that surge into the dt tank at once (so with no j tube on my overflows and the loudest toilet flushing sound every 2 min it had to go)