An apparatus and system are disclosed for fluid transfer. The apparatus includes a fluid receiver that includes a receiver base having an inlet and an outlet. The apparatus also includes a tubular cylinder having an inlet and an outlet, where the outlet of the tubular cylinder is coupled to the inlet of the receiver base. The tubular cylinder has a keyed outer surface, which in one embodiment, includes at least one surface feature extending annularly around the surface of the tubular cylinder. The surface feature engages with at least one tumbler in a fluid nozzle. The system includes the fluid receiver and a fluid nozzle. The fluid nozzle, in one embodiment, has an arrangement of tumblers that are positioned adjacent an inlet of the fluid nozzle and configured to engage the keyed outer surface of the fluid receiver.