Koolance PMP-400 Pump, ID 10mm (3/8in) The PMP-400 is a high-pressure pump with a very low profile format. Maximum Flow Rate: 7.5 L/min (1.9 gal/min). Maximum Head Pressure: 5.5m (18ft). Motor: Brushless DC, electronically commutated, spherical motor. Power Consumption (at max): 20W.