Wayne JSU50 1/2 hp Cast Iron Shallow Well Jet Pump 1/2 HP; max. flow rate is 324 Gallons Per Hour; (50 PSI) 3/4 in. NPT discharge with 1-1/4 in. suction Dual voltage (120V/240V) high efficiency square flange motor (factory set for 240V) Pressure switch is pre-set at 30-50 PSI for automatic operation Durable cast iron volute with dedicated priming port for volute filling