PumpMaster 2- 3:1 Oil Pump for 270/500 Gal 48" Tank. Double acting air operated medium pressure pump for dispensing lubricants from mobile units, oil distribution packages and small systems. Pump includes height 2″ NPTM adjustable bung adaptor for tank or drum bung mounting. Built in pressure relief port for optional (PN 609 007) pressure relief valve. Fluid Handled: Synthetic and mineral based oil, Trasmissions Fluid, Hydraulic Oil, Gear Lube.