Which standpipe control valve is commonly located outside and features an external stem and wheel?

• A. Post indicator valve assembly
• B. Outside screw and yoke valve
• C. Wall post indicator valve
• D. Post indicator valve

Answer: (B)

External access and an exposed operating wheel identify the Outside Screw and Yoke valve. Its stem extends outside the valve body and is threaded, with a wheel on top that you turn to open or close the valve. This design is common on exterior standpipe risers so firefighters can locate and operate the valve from outside the building during a fire attack. The wheel and external stem are the telltale features that distinguish it. Other standpipe valve types may have indicators to show open/closed status or be mounted in walls or posts, but they don’t typically present an exposed wheel-driven stem like this one.