The Portagas pressure Demand Flow Regulators (DFR) are designed to use with our PortaGreen Returnable and High Capacity Returnable (HCRT) line of cylinders. the DFR has been designed to provide the correct gas flow to instruments that have internal pumps. Typical activation suction is form 0 to 3 inches of water column. The DFR can be configured to inlet pressure ranging from 250 psi up to 3000 psi with an outlet fitting of 3/16 inch hose barb. The DFR is available with an aluminum body for non-reactive gases and a stainless steel body for reactive gas services.