A modular flow controller for controlling fluid flow, including a flow control assembly for establishing a desired flow rate. The flow control assembly includes a flow adjustment interface rendered in a substantially horizontal position for receiving a control input to establish a flow rate. The modular flow control assembly includes a valve assembly in operational engagement with the flow control assembly for discharging a desired quantity of fluid from the modular flow controller. The modular flow controller is preferably applied to a beverage dispenser's dispensing valve assembly, wherein the dispensing valve assembly includes a faucet plate. Accordingly, due to the configuration of the modular flow controller, it is unnecessary to secure the modular flow controller to the faucet plate for operation thereof. The modular flow controller includes a drink integrity locking unit for preventing access to a flow adjustment interface. The modular flow controller may include a back block interface element for linking the modular flow controller to a back block. The modular flow controller may include a fitting lock for a fluid carrying element, such as standard fittings, couplings as well as beverage fluid lines. The fitting lock, in turn, includes a body and a sliding element in cooperative engagement with the body for securing the fluid carrying element to the body. The modular flow controller may include a coil assembly to restrict fluid flow. The coil assembly, in turn, includes an actuator retainment lip extending outwardly for supporting an actuator element within a plunger chamber.