Pierce Pumper - 3-17.3 Priming a Two -S

OPERATION
3-40 / Pierce Pumper
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3-17.3 Priming a Two-Stage Pump
Shift the Transfer Valve to the VOLUME setting when priming a two-stage pump.
Changing between stages on a two-stage pump can cause a pressure spike in discharge hoses.
Give all fire suppression crews warning BEFORE changing stages.