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The FlowPort is the counter part to the StockPort and contains an acausal connector with the Real potential variable stock indicating the stored amount in a connected reservoir and the Real flow variable rate indicating the rate of flow into the connected stock (rate < 0) or out of the connected stock (rate > 0).
There are also two Boolean input variables, which indicate whether draining the connected reservoir (stopOutflow) or filling it (stopInflow) is prohibited. These signals originate with the connected stock.