The diaphragm orifice labeled "H", as shown in the illustration is used as a/an __________. GS-0155

Correct Answer: Option C — time delay

The diaphragm orifice labeled "H" functions as a bypass or metering orifice. It restricts the flow of water into the upper chamber, creating a controlled time delay. This delay allows the main valve to remain open for the duration of the flush before pressure equalizes to force the valve closed.