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At locations where mass flow can enter or leave the network an element with node label 0 at the entry and exit, respectively, has to be specified.
Its fluid section type for gas networks can be any of the available types. The only effect the type has is whether the nonzero node is considered to be a chamber (zero velocity and hence the total temperature equals the static temperature) or a potential pipe connection (for a pipe connection node the total temperature does not equal the static temperature). The pipe connection types are GASPIPE, RESTRICTOR except for RESTRICTOR WALL ORIFICE and USER types starting with UP, all other types are chamber-like. A node is a pipe connection node if exactly two gas network elements are connected to this node and all of them are pipe connection types.
For chamber-like entries and exits it is strongly recommended to use the type INOUT, to be specified on the *FLUID SECTION card. For this type there are no extra parameters.