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In Figure 60: Hydraulics blocks, ports, & component properties, the
resistance:ViscousResistance has to be treated as a PhSVariable not a PhSConstant or the system of equations for ConnectedTanks is ill-formed. Otherwise get an invalid system:
'The model has 6 variables and 7 equations.'
Even though resistance:ViscousResistance is effectively a constant (as it is always computed from values that don't change with time) it is in fact handled like a variable via a Constraint:
{resistance=(8*viscosity*length)/(3.1416*(radius^4))}