The Equilibar ZF (Zero Flow) back pressure regulator is designed for demanding laboratory applications where precision must be maintained through a wide flow rate window, including nano and true zero flow rate. Such requirements are common in upstream petroleum core analysis applications where reactor pressures must be maintained precisely between the flow and no-flow condition. In this video, we demonstrate the Equilibar ZF regulator at about 700 psi holding constant pressure between true zero flow and 2 liters/minute.