It is a standby pump which is installed to ensure that the system is functioning even during mains failure. This pump starts automatically when there is pressure loss felt in the hydrant line, but has to be switched off manually for obvious reasons. Flow 1620 1620 2850 2850 2850 2850 2850 2850 Head 56 70 70/75 80 90 100 90 100 Model db 80/32 ce 65/32 ce 80/40 ce 80/40 ce 80/40 ce 80/40 Ce 100/40 cphm 125/45 Type End Suction Suc x Del 80x65 125x80 125x100 125x80 RPM 1800 2150 1800 2000/2150 2150 1800 HP 43 50 85 92/94 149 133