A system for preparing and dispensing a nitrogen infused beverage, comprising: a bag-in-box beverage concentrate container ; a first diaphragm pump controlling flow of a beverage concentrate through a beverage line from the bag-in-box container to a first flow controlling needle valve and from the first needle valve to a liquid mixing point , wherein a first back-check valve is optionally present prior to the first flow controlling needle valve or after the flow controlling needle valve and prior to the liquid mixing point ; a second diaphragm pump controlling water flow through a water line from a water supply to a liquid/gas contactor membrane unit and from the contactor unit to a second flow controlling needle valve and from the second needle valve to the liquid mixing point wherein a second back-check valve is optionally present prior to the second flow controlling needle valve or after the flow controlling needle valve and prior to the liquid mixing point ; a controlled pressurized supply of a gas comprising at least 50% by weight nitrogen attached to the liquid/gas contactor membrane unit ; the liquid/gas contactor membrane unit ; a nitrogen infused beverage line from the liquid mixing point to a beverage faucet; wherein the beverage faucet is a slow release faucet such that the infused beverage in the nitrogen infused beverage line remains under pressure during dispense of the beverage from the faucet, and the nitrogen gas feed supply line to the liquid/gas contactor membrane unit comprises a check valve preventing liquid flow from the liquid/gas contactor membrane unit into the pressurized gas supply line. a bag-in-box beverage concentrate container ; a first diaphragm pump controlling flow of a beverage concentrate through a beverage line from the bag-in-box container to a first flow controlling needle valve and from the first needle valve to a liquid mixing point , wherein a first back-check valve is optionally present prior to the first flow controlling needle valve or after the flow controlling needle valve and prior to the liquid mixing point ; a second diaphragm pump controlling water flow through a water line from a water supply to a liquid/gas contactor membrane unit and from the contactor unit to a second flow controlling needle valve and from the second needle valve to the liquid mixing point wherein a second back-check valve is optionally present prior to the second flow controlling needle valve or after the flow controlling needle valve and prior to the liquid mixing point ; a controlled pressurized supply of a gas comprising at least 50% by weight nitrogen attached to the liquid/gas contactor membrane unit ; the liquid/gas contactor membrane unit ; a nitrogen infused beverage line from the liquid mixing point to a beverage faucet; wherein the beverage faucet is a slow release faucet such that the infused beverage in the nitrogen infused beverage line remains under pressure during dispense of the beverage from the faucet, and the nitrogen gas feed supply line to the liquid/gas contactor membrane unit comprises a check valve preventing liquid flow from the liquid/gas contactor membrane unit into the pressurized gas supply line. <EOS>