Where should the float rod be adjusted to properly operate the inlet valve?

The float rod should be adjusted to about 25.4 mm (1 inch) from the top of the overflow pipe to ensure optimal operation of the inlet valve. This distance allows the float to rise adequately in relation to the water level in the tank. When the water level drops, the float descends, allowing the valve to open and refill the tank. Conversely, as the float rises when the tank fills, it reaches the set level (in this case, 25.4 mm from the top of the overflow pipe), which closes the inlet valve and stops the flow of water. This mechanism is crucial for preventing overflow and maintaining an efficient water level in the tank. The chosen distance provides a balance between allowing sufficient water to enter without risking overflow while also maintaining functionality and responsiveness of the system.