For the 4A backpack pump, what is the discharge reach?

• A. 1-3 m
• B. 9-12 m
• C. 3-9 m
• D. 6-12 m

Answer: (C)

Discharge reach is the horizontal distance the water stream travels from the nozzle when the pump is delivering water. With a 4A backpack pump, you’re using a compact, portable device whose reach is limited by the pressure the pump can sustain at the nozzle and by the nozzle’s characteristics (whether it’s set for a solid stream, a fog, or a combination).

Under the standard exam setup for the 4A backpack pump—typical hose length, normal nozzle setting, and normal discharge conditions—the water stream travels about 3 to 9 meters. This range reflects a balance between enough reach to hit targets at a safe distance without losing too much control or flow due to friction losses in the hose. Distances below 3 meters usually indicate either a more vertical angle or a low-flow/nozzle setting, while reaching beyond 9 meters would require higher pressure and/or a different configuration that the 4A pack isn’t configured to reliably sustain.