Harris 3500 600 580 Single Stage Argon Helium Nitrogen Regulator 3003539 Model 741 Continuous flow monitoring providing real time Water Cooled Continuous flow monitoring providing real time protection for welding equipment It reads 0 when the solenoid is closed and jumps to the set flow rate when open For most MIG TIG applications: 15–35 PSI delivery pressure with a downstream flow control valve or flowmeter Central cylinder manifold systems: Shops running multiple welding stations from a central argon manifold use industrial grade regulators at the cylinder header to manage the combined flow of several stations simultaneously