A dialysis concentrate production assembly for producing a dialysis concentrate liquid by dissolving a dry concentrate in water. The dialysis concentrate production assembly includes a mobile interchangeable container which contains the dry concentrate and a stationary production system. The mobile interchangeable container includes an outlet port and a combined port. The stationary production system is fluidically connected to the outlet port and to the combined port via coupling assemblies via which the dry concentrate is mixed with the water to form the liquid dialysis concentrate. At least one coupling assembly includes a system-side coupling body with a liquid line connector having a non-circular cross-section, and a container-side coupling body with a liquid line socket having a non-circular cross-section which is complementary to the non-circular cross section of the liquid line connector. The liquid line connector and the liquid line socket can be plugged together in only one single rotational position.