When servicing a flushometer, it can be turned off at the ________.

• A. Main Shutoff
• B. Control Stop
• C. Meter Valve
• D. Service Valve

Answer: (B)

The key idea is that the flushometer’s water supply is isolated at the fixture’s own shutoff, called the control stop. This valve is installed on the line feeding the flushometer and is designed to quickly shut off water to that specific device for maintenance, without affecting the rest of the building. Using the main shutoff would cut off water to the entire system, which isn’t needed for servicing a single fixture. The meter valve controls service from the street to the building and isn’t used for isolating an individual flushometer. While a service valve might exist on some lines, the standard, most appropriate point to shut off for servicing a flushometer is the control stop.