Hypro 4001N (4001N-A) Roller Pump 9.1GPM, 150 PSI Max RPM 1800. Port sizes are 3/4″ NPT. Pump Shaft rotation is Clockwise. 5/8″ Solid Shaft (1/2″ Hollow Shaft also available). This 4 roller pump achieves up to 9.1 GPM (34.4 LPM) and 150 PSI (10.3 bar). The series includes models 4001C, 4001N and 4001XL.