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The StockPort is a composite connector and consists of an acausal connector with the Real potential variable stock indicating the stored amount in a reservoir and the Real flow variable rate indicating the rate of flow into (rate > 0) or out of (rate < 0) the reservoir.
There are also two Boolean output variables, which indicate whether draining the reservoir (stopOutflow) or filling it (stopInflow) is prohibited. Since a generic reservoir will have two ports it is possible to allow inflows and outflows on both ports (standard) or give the stock a clear direction of flow with one port serving as inflow and the other as outflow connector.