The easiest way to determine if the pump is single stage or two stage is to look for which control on the pump panel?

• A. Transfer Valve Switch
• B. Pressure Gauge
• C. Impeller Shield
• D. Relief Valve

Answer: (A)

The transfer valve switch is the control that reveals whether the pump is in single-stage or two-stage operation. A two-stage pump uses a transfer valve to route flow between stages, and the switch selects or indicates whether the second stage is engaged. If the switch is set for two-stage operation, the pump is capable of and currently operating in two-stage mode; if not, it’s in single-stage. The other items don’t indicate stage: a pressure gauge shows pressure, an impeller shield is just a protective cover, and a relief valve is a safety device.