The item flow does not require the heater to accept any kind of fluid, because the source of flow is still producing water, regardless of the generality of the item flow.

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Figure 9-15: Usage example of item flows in internal block diagrams
Source
OMG Systems Modeling Language (SysML) 1.6
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
INFO
UML keywords
InformationFlow
SysML keywords
ItemFlow
The connection to the water heater is compatible because it accepts any kind of water, including distilled.
Full quote
The item flow does not require the heater to accept any kind of fluid, because the source of flow is still producing water, regardless of the generality of the item flow.
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Item flows in internal block diagrams specify flows local to a block.
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