If water continues to flow excessively from the device shown in the illustration, the problem is most likely due to __________. GS-0155

Correct Answer: Option C — item "H" being fouled or plugged

In a standard toilet flush valve assembly, item H typically represents the bypass orifice or metering pin. If this orifice becomes fouled or plugged, the pressure chamber above the diaphragm cannot repressurize, preventing the valve from closing and causing water to flow continuously into the toilet bowl.