diff --git a/PythonModels/systems/test_mql_closure.py b/PythonModels/systems/test_mql_closure.py
index 70ed64b..a5c90ba 100644
--- a/PythonModels/systems/test_mql_closure.py
+++ b/PythonModels/systems/test_mql_closure.py
@@ -1944,6 +1944,38 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             connected_h_2=port_2_properties.h,
         )
 
+    @staticmethod
+    def _write_two_state_connection_line(
+        *,
+        line: AmesimPnl0003Pipe,
+        port_1_properties: ThermodynamicProperties,
+        port_1_flow: float,
+        port_2_properties: ThermodynamicProperties,
+        port_2_flow: float,
+    ) -> None:
+        line.port_1.p = port_1_properties.p
+        line.port_1.m_flow = port_1_flow
+        line.port_1.h_outflow = port_1_properties.h
+        line.port_2.p = port_2_properties.p
+        line.port_2.m_flow = port_2_flow
+        line.port_2.h_outflow = port_2_properties.h
+
+    @staticmethod
+    def _two_state_connection_line_derivatives(
+        *,
+        line: AmesimPnl0003Pipe,
+        port_1_properties: ThermodynamicProperties,
+        port_1_flow: float,
+        port_2_connected_properties: ThermodynamicProperties,
+        port_2_flow: float,
+    ) -> tuple[VolumeState, VolumeState]:
+        return line.derivatives_from_connections(
+            port_1_m_flow=port_1_flow,
+            connected_h_1=port_1_properties.h,
+            port_2_m_flow=port_2_flow,
+            connected_h_2=port_2_connected_properties.h,
+        )
+
     def _write_port_states(
         self,
         snapshot: TestMqlPn3P4NodeChamberSegmentSnapshot,
@@ -1966,13 +1998,13 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             outlet_orifice=self.components.outlet_orifice,
         )
 
-        node_line = self.components.node_line
-        node_line.port_1.p = snapshot.node_line_port_1.p
-        node_line.port_1.m_flow = snapshot.node_to_pnl0003_flow
-        node_line.port_1.h_outflow = snapshot.node_line_port_1.h
-        node_line.port_2.p = snapshot.node_line_port_2.p
-        node_line.port_2.m_flow = -snapshot.pnl0003_to_p4_flow
-        node_line.port_2.h_outflow = snapshot.node_line_port_2.h
+        self._write_two_state_connection_line(
+            line=self.components.node_line,
+            port_1_properties=snapshot.node_line_port_1,
+            port_1_flow=snapshot.node_to_pnl0003_flow,
+            port_2_properties=snapshot.node_line_port_2,
+            port_2_flow=-snapshot.pnl0003_to_p4_flow,
+        )
 
         node_orifice = self.components.node_orifice
         node_orifice.port_a.p = snapshot.node_line_port_2.p
@@ -2062,13 +2094,13 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             port_2_flow=snapshot.p4_bridge_to_port1_next_line_flow,
         )
 
-        p4_port1_next_orifice_line = self.components.p4_port1_next_orifice_line
-        p4_port1_next_orifice_line.port_1.p = snapshot.p4_port1_next_orifice_line_port_1.p
-        p4_port1_next_orifice_line.port_1.m_flow = snapshot.p4_port1_next_orifice_node_to_line_flow
-        p4_port1_next_orifice_line.port_1.h_outflow = snapshot.p4_port1_next_orifice_line_port_1.h
-        p4_port1_next_orifice_line.port_2.p = snapshot.p4_port1_next_orifice_line_port_2.p
-        p4_port1_next_orifice_line.port_2.m_flow = -snapshot.p4_port1_next_orifice_to_output_line_flow
-        p4_port1_next_orifice_line.port_2.h_outflow = snapshot.p4_port1_next_orifice_line_port_2.h
+        self._write_two_state_connection_line(
+            line=self.components.p4_port1_next_orifice_line,
+            port_1_properties=snapshot.p4_port1_next_orifice_line_port_1,
+            port_1_flow=snapshot.p4_port1_next_orifice_node_to_line_flow,
+            port_2_properties=snapshot.p4_port1_next_orifice_line_port_2,
+            port_2_flow=-snapshot.p4_port1_next_orifice_to_output_line_flow,
+        )
 
         p4_port1_next_orifice = self.components.p4_port1_next_orifice
         p4_port1_next_orifice.port_a.p = snapshot.p4_port1_next_orifice_line_port_2.p
@@ -2094,13 +2126,13 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         p4_port1_next_orifice_resistance.port_2.m_flow = -snapshot.p4_port1_next_orifice_resistance_node_to_next_flow
         p4_port1_next_orifice_resistance.port_2.h_outflow = snapshot.p4_port1_next_orifice_line_port_1.h
 
-        p4_port1_next_orifice_resistance_line = self.components.p4_port1_next_orifice_resistance_line
-        p4_port1_next_orifice_resistance_line.port_1.p = snapshot.p4_port1_next_orifice_resistance_line_port_1.p
-        p4_port1_next_orifice_resistance_line.port_1.m_flow = snapshot.p4_port1_next_orifice_resistance_node_to_line_flow
-        p4_port1_next_orifice_resistance_line.port_1.h_outflow = snapshot.p4_port1_next_orifice_resistance_line_port_1.h
-        p4_port1_next_orifice_resistance_line.port_2.p = snapshot.p4_port1_next_orifice_resistance_line_port_2.p
-        p4_port1_next_orifice_resistance_line.port_2.m_flow = -snapshot.p4_port1_next_orifice_resistance_to_p4_flow
-        p4_port1_next_orifice_resistance_line.port_2.h_outflow = snapshot.p4_port1_next_orifice_resistance_line_port_2.h
+        self._write_two_state_connection_line(
+            line=self.components.p4_port1_next_orifice_resistance_line,
+            port_1_properties=snapshot.p4_port1_next_orifice_resistance_line_port_1,
+            port_1_flow=snapshot.p4_port1_next_orifice_resistance_node_to_line_flow,
+            port_2_properties=snapshot.p4_port1_next_orifice_resistance_line_port_2,
+            port_2_flow=-snapshot.p4_port1_next_orifice_resistance_to_p4_flow,
+        )
 
         p4_port1_next_orifice_resistance_orifice = self.components.p4_port1_next_orifice_resistance_orifice
         p4_port1_next_orifice_resistance_orifice.port_a.p = snapshot.p4_port1_next_orifice_resistance_line_port_2.p
@@ -2157,13 +2189,13 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             node_to_line_flow=snapshot.p4_bridge_node_to_primary_line_flow,
         )
 
-        p4_port1_remote_orifice_line = self.components.p4_port1_remote_orifice_line
-        p4_port1_remote_orifice_line.port_1.p = snapshot.p4_port1_remote_orifice_line_port_1.p
-        p4_port1_remote_orifice_line.port_1.m_flow = snapshot.p4_port1_remote_node_to_orifice_line_flow
-        p4_port1_remote_orifice_line.port_1.h_outflow = snapshot.p4_port1_remote_orifice_line_port_1.h
-        p4_port1_remote_orifice_line.port_2.p = snapshot.p4_port1_remote_orifice_line_port_2.p
-        p4_port1_remote_orifice_line.port_2.m_flow = -snapshot.p4_port1_remote_orifice_to_node_flow
-        p4_port1_remote_orifice_line.port_2.h_outflow = snapshot.p4_port1_remote_orifice_line_port_2.h
+        self._write_two_state_connection_line(
+            line=self.components.p4_port1_remote_orifice_line,
+            port_1_properties=snapshot.p4_port1_remote_orifice_line_port_1,
+            port_1_flow=snapshot.p4_port1_remote_node_to_orifice_line_flow,
+            port_2_properties=snapshot.p4_port1_remote_orifice_line_port_2,
+            port_2_flow=-snapshot.p4_port1_remote_orifice_to_node_flow,
+        )
 
         p4_port1_remote_orifice = self.components.p4_port1_remote_orifice
         p4_port1_remote_orifice.port_a.p = snapshot.p4_port1_remote_orifice_line_port_2.p
@@ -2236,13 +2268,13 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             port_2_flow=snapshot.p4_port3_next_to_bridge_line_flow,
         )
 
-        p4_port3_next_orifice_line = self.components.p4_port3_next_orifice_line
-        p4_port3_next_orifice_line.port_1.p = snapshot.p4_port3_next_orifice_line_port_1.p
-        p4_port3_next_orifice_line.port_1.m_flow = snapshot.p4_port3_next_orifice_node_to_line_flow
-        p4_port3_next_orifice_line.port_1.h_outflow = snapshot.p4_port3_next_orifice_line_port_1.h
-        p4_port3_next_orifice_line.port_2.p = snapshot.p4_port3_next_orifice_line_port_2.p
-        p4_port3_next_orifice_line.port_2.m_flow = -snapshot.p4_port3_next_orifice_to_output_line_flow
-        p4_port3_next_orifice_line.port_2.h_outflow = snapshot.p4_port3_next_orifice_line_port_2.h
+        self._write_two_state_connection_line(
+            line=self.components.p4_port3_next_orifice_line,
+            port_1_properties=snapshot.p4_port3_next_orifice_line_port_1,
+            port_1_flow=snapshot.p4_port3_next_orifice_node_to_line_flow,
+            port_2_properties=snapshot.p4_port3_next_orifice_line_port_2,
+            port_2_flow=-snapshot.p4_port3_next_orifice_to_output_line_flow,
+        )
 
         p4_port3_next_orifice = self.components.p4_port3_next_orifice
         p4_port3_next_orifice.port_a.p = snapshot.p4_port3_next_orifice_line_port_2.p
@@ -2294,13 +2326,13 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         p4_port3_next_orifice_resistance.port_2.m_flow = -snapshot.p4_port3_next_resistance_node_to_next_flow
         p4_port3_next_orifice_resistance.port_2.h_outflow = snapshot.p4_port3_next_orifice_line_port_1.h
 
-        p4_port3_next_resistance_node_line = self.components.p4_port3_next_resistance_node_line
-        p4_port3_next_resistance_node_line.port_1.p = snapshot.p4_port3_next_resistance_node_line_port_1.p
-        p4_port3_next_resistance_node_line.port_1.m_flow = snapshot.p4_port3_next_resistance_node_to_line_flow
-        p4_port3_next_resistance_node_line.port_1.h_outflow = snapshot.p4_port3_next_resistance_node_line_port_1.h
-        p4_port3_next_resistance_node_line.port_2.p = snapshot.p4_port3_next_resistance_node_line_port_2.p
-        p4_port3_next_resistance_node_line.port_2.m_flow = -snapshot.p4_port3_next_resistance_to_output_line_flow
-        p4_port3_next_resistance_node_line.port_2.h_outflow = snapshot.p4_port3_next_resistance_node_line_port_2.h
+        self._write_two_state_connection_line(
+            line=self.components.p4_port3_next_resistance_node_line,
+            port_1_properties=snapshot.p4_port3_next_resistance_node_line_port_1,
+            port_1_flow=snapshot.p4_port3_next_resistance_node_to_line_flow,
+            port_2_properties=snapshot.p4_port3_next_resistance_node_line_port_2,
+            port_2_flow=-snapshot.p4_port3_next_resistance_to_output_line_flow,
+        )
 
         p4_port3_next_resistance_orifice = self.components.p4_port3_next_resistance_orifice
         p4_port3_next_resistance_orifice.port_a.p = snapshot.p4_port3_next_resistance_node_line_port_2.p
@@ -2352,13 +2384,13 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             ),
         )
 
-        p4_port3_remote_orifice_line = self.components.p4_port3_remote_orifice_line
-        p4_port3_remote_orifice_line.port_1.p = snapshot.p4_port3_remote_orifice_line_port_1.p
-        p4_port3_remote_orifice_line.port_1.m_flow = snapshot.p4_port3_remote_node_to_orifice_line_flow
-        p4_port3_remote_orifice_line.port_1.h_outflow = snapshot.p4_port3_remote_orifice_line_port_1.h
-        p4_port3_remote_orifice_line.port_2.p = snapshot.p4_port3_remote_orifice_line_port_2.p
-        p4_port3_remote_orifice_line.port_2.m_flow = -snapshot.p4_port3_remote_orifice_to_node_flow
-        p4_port3_remote_orifice_line.port_2.h_outflow = snapshot.p4_port3_remote_orifice_line_port_2.h
+        self._write_two_state_connection_line(
+            line=self.components.p4_port3_remote_orifice_line,
+            port_1_properties=snapshot.p4_port3_remote_orifice_line_port_1,
+            port_1_flow=snapshot.p4_port3_remote_node_to_orifice_line_flow,
+            port_2_properties=snapshot.p4_port3_remote_orifice_line_port_2,
+            port_2_flow=-snapshot.p4_port3_remote_orifice_to_node_flow,
+        )
 
         p4_port3_remote_orifice_resistance = self.components.p4_port3_remote_orifice_resistance
         p4_port3_remote_orifice_resistance.port_1.p = snapshot.p4_port3_remote_orifice_line_port_1.p
@@ -2368,13 +2400,13 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         p4_port3_remote_orifice_resistance.port_2.m_flow = -snapshot.p4_port3_remote_node_to_resistance_flow
         p4_port3_remote_orifice_resistance.port_2.h_outflow = snapshot.p4_port3_remote_resistance_node_line_port_1.h
 
-        p4_port3_remote_resistance_node_line = self.components.p4_port3_remote_resistance_node_line
-        p4_port3_remote_resistance_node_line.port_1.p = snapshot.p4_port3_remote_resistance_node_line_port_1.p
-        p4_port3_remote_resistance_node_line.port_1.m_flow = snapshot.p4_port3_remote_resistance_node_to_line_flow
-        p4_port3_remote_resistance_node_line.port_1.h_outflow = snapshot.p4_port3_remote_resistance_node_line_port_1.h
-        p4_port3_remote_resistance_node_line.port_2.p = snapshot.p4_port3_remote_resistance_node_line_port_2.p
-        p4_port3_remote_resistance_node_line.port_2.m_flow = -snapshot.p4_port3_remote_resistance_to_output_line_flow
-        p4_port3_remote_resistance_node_line.port_2.h_outflow = snapshot.p4_port3_remote_resistance_node_line_port_2.h
+        self._write_two_state_connection_line(
+            line=self.components.p4_port3_remote_resistance_node_line,
+            port_1_properties=snapshot.p4_port3_remote_resistance_node_line_port_1,
+            port_1_flow=snapshot.p4_port3_remote_resistance_node_to_line_flow,
+            port_2_properties=snapshot.p4_port3_remote_resistance_node_line_port_2,
+            port_2_flow=-snapshot.p4_port3_remote_resistance_to_output_line_flow,
+        )
 
         p4_port3_remote_resistance_orifice = self.components.p4_port3_remote_resistance_orifice
         p4_port3_remote_resistance_orifice.port_a.p = snapshot.p4_port3_remote_resistance_node_line_port_2.p
@@ -2431,13 +2463,15 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             ),
             internal_h=snapshot.chamber.h,
         )
-        node_line_derivative_1, node_line_derivative_2 = (
-            self.components.node_line.derivatives_from_connections(
-                port_1_m_flow=snapshot.node_to_pnl0003_flow,
-                connected_h_1=snapshot.node_line_port_1.h,
-                port_2_m_flow=-snapshot.pnl0003_to_p4_flow,
-                connected_h_2=snapshot.p4_primary_line.h,
-            )
+        (
+            node_line_derivative_1,
+            node_line_derivative_2,
+        ) = self._two_state_connection_line_derivatives(
+            line=self.components.node_line,
+            port_1_properties=snapshot.node_line_port_1,
+            port_1_flow=snapshot.node_to_pnl0003_flow,
+            port_2_connected_properties=snapshot.p4_primary_line,
+            port_2_flow=-snapshot.pnl0003_to_p4_flow,
         )
         (
             p4_primary_derivative,
@@ -2522,13 +2556,15 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             chamber_to_line_flow=snapshot.p4_bridge_chamber_to_line_flow,
             node_to_line_flow=snapshot.p4_bridge_node_to_primary_line_flow,
         )
-        p4_port1_remote_orifice_derivative_1, p4_port1_remote_orifice_derivative_2 = (
-            self.components.p4_port1_remote_orifice_line.derivatives_from_connections(
-                port_1_m_flow=snapshot.p4_port1_remote_node_to_orifice_line_flow,
-                connected_h_1=snapshot.p4_port1_remote_orifice_line_port_1.h,
-                port_2_m_flow=-snapshot.p4_port1_remote_orifice_to_node_flow,
-                connected_h_2=snapshot.p4_port1_remote_primary_line.h,
-            )
+        (
+            p4_port1_remote_orifice_derivative_1,
+            p4_port1_remote_orifice_derivative_2,
+        ) = self._two_state_connection_line_derivatives(
+            line=self.components.p4_port1_remote_orifice_line,
+            port_1_properties=snapshot.p4_port1_remote_orifice_line_port_1,
+            port_1_flow=snapshot.p4_port1_remote_node_to_orifice_line_flow,
+            port_2_connected_properties=snapshot.p4_port1_remote_primary_line,
+            port_2_flow=-snapshot.p4_port1_remote_orifice_to_node_flow,
         )
         p4_port3_derivative = self._connection_line_derivative(
             line=self.components.p4_port3_line,
@@ -2594,11 +2630,12 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         (
             p4_port3_remote_resistance_derivative_1,
             p4_port3_remote_resistance_derivative_2,
-        ) = self.components.p4_port3_remote_resistance_node_line.derivatives_from_connections(
-            port_1_m_flow=snapshot.p4_port3_remote_resistance_node_to_line_flow,
-            connected_h_1=snapshot.p4_port3_remote_resistance_node_line_port_1.h,
-            port_2_m_flow=-snapshot.p4_port3_remote_resistance_to_output_line_flow,
-            connected_h_2=snapshot.p4_port3_remote_resistance_output_line.h,
+        ) = self._two_state_connection_line_derivatives(
+            line=self.components.p4_port3_remote_resistance_node_line,
+            port_1_properties=snapshot.p4_port3_remote_resistance_node_line_port_1,
+            port_1_flow=snapshot.p4_port3_remote_resistance_node_to_line_flow,
+            port_2_connected_properties=snapshot.p4_port3_remote_resistance_output_line,
+            port_2_flow=-snapshot.p4_port3_remote_resistance_to_output_line_flow,
         )
         p4_port3_remote_resistance_output_derivative = (
             self.components.p4_port3_remote_resistance_output_line.derivatives_from_connections(
@@ -2608,21 +2645,25 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
                 connected_h_2=snapshot.p4_port3_far_primary_line.h,
             )
         )
-        p4_port3_remote_orifice_derivative_1, p4_port3_remote_orifice_derivative_2 = (
-            self.components.p4_port3_remote_orifice_line.derivatives_from_connections(
-                port_1_m_flow=snapshot.p4_port3_remote_node_to_orifice_line_flow,
-                connected_h_1=snapshot.p4_port3_remote_orifice_line_port_1.h,
-                port_2_m_flow=-snapshot.p4_port3_remote_orifice_to_node_flow,
-                connected_h_2=snapshot.p4_port3_remote_primary_line.h,
-            )
+        (
+            p4_port3_remote_orifice_derivative_1,
+            p4_port3_remote_orifice_derivative_2,
+        ) = self._two_state_connection_line_derivatives(
+            line=self.components.p4_port3_remote_orifice_line,
+            port_1_properties=snapshot.p4_port3_remote_orifice_line_port_1,
+            port_1_flow=snapshot.p4_port3_remote_node_to_orifice_line_flow,
+            port_2_connected_properties=snapshot.p4_port3_remote_primary_line,
+            port_2_flow=-snapshot.p4_port3_remote_orifice_to_node_flow,
         )
-        p4_port3_next_orifice_derivative_1, p4_port3_next_orifice_derivative_2 = (
-            self.components.p4_port3_next_orifice_line.derivatives_from_connections(
-                port_1_m_flow=snapshot.p4_port3_next_orifice_node_to_line_flow,
-                connected_h_1=snapshot.p4_port3_next_orifice_line_port_1.h,
-                port_2_m_flow=-snapshot.p4_port3_next_orifice_to_output_line_flow,
-                connected_h_2=snapshot.p4_port3_next_orifice_output_line.h,
-            )
+        (
+            p4_port3_next_orifice_derivative_1,
+            p4_port3_next_orifice_derivative_2,
+        ) = self._two_state_connection_line_derivatives(
+            line=self.components.p4_port3_next_orifice_line,
+            port_1_properties=snapshot.p4_port3_next_orifice_line_port_1,
+            port_1_flow=snapshot.p4_port3_next_orifice_node_to_line_flow,
+            port_2_connected_properties=snapshot.p4_port3_next_orifice_output_line,
+            port_2_flow=-snapshot.p4_port3_next_orifice_to_output_line_flow,
         )
         p4_port3_next_orifice_output_derivative = (
             self.components.p4_port3_next_orifice_output_line.derivatives_from_connections(
@@ -2664,11 +2705,12 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         (
             p4_port3_next_resistance_derivative_1,
             p4_port3_next_resistance_derivative_2,
-        ) = self.components.p4_port3_next_resistance_node_line.derivatives_from_connections(
-            port_1_m_flow=snapshot.p4_port3_next_resistance_node_to_line_flow,
-            connected_h_1=snapshot.p4_port3_next_resistance_node_line_port_1.h,
-            port_2_m_flow=-snapshot.p4_port3_next_resistance_to_output_line_flow,
-            connected_h_2=snapshot.p4_port3_next_resistance_output_line.h,
+        ) = self._two_state_connection_line_derivatives(
+            line=self.components.p4_port3_next_resistance_node_line,
+            port_1_properties=snapshot.p4_port3_next_resistance_node_line_port_1,
+            port_1_flow=snapshot.p4_port3_next_resistance_node_to_line_flow,
+            port_2_connected_properties=snapshot.p4_port3_next_resistance_output_line,
+            port_2_flow=-snapshot.p4_port3_next_resistance_to_output_line_flow,
         )
         p4_port3_next_resistance_output_derivative = (
             self.components.p4_port3_next_resistance_output_line.derivatives_from_connections(
@@ -2712,11 +2754,12 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         (
             p4_port1_next_orifice_derivative_1,
             p4_port1_next_orifice_derivative_2,
-        ) = self.components.p4_port1_next_orifice_line.derivatives_from_connections(
-            port_1_m_flow=snapshot.p4_port1_next_orifice_node_to_line_flow,
-            connected_h_1=snapshot.p4_port1_next_orifice_line_port_1.h,
-            port_2_m_flow=-snapshot.p4_port1_next_orifice_to_output_line_flow,
-            connected_h_2=snapshot.p4_port1_next_orifice_output_line.h,
+        ) = self._two_state_connection_line_derivatives(
+            line=self.components.p4_port1_next_orifice_line,
+            port_1_properties=snapshot.p4_port1_next_orifice_line_port_1,
+            port_1_flow=snapshot.p4_port1_next_orifice_node_to_line_flow,
+            port_2_connected_properties=snapshot.p4_port1_next_orifice_output_line,
+            port_2_flow=-snapshot.p4_port1_next_orifice_to_output_line_flow,
         )
         p4_port1_next_orifice_output_derivative = (
             self.components.p4_port1_next_orifice_output_line.derivatives_from_connections(
@@ -2729,11 +2772,12 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         (
             p4_port1_next_orifice_resistance_derivative_1,
             p4_port1_next_orifice_resistance_derivative_2,
-        ) = self.components.p4_port1_next_orifice_resistance_line.derivatives_from_connections(
-            port_1_m_flow=snapshot.p4_port1_next_orifice_resistance_node_to_line_flow,
-            connected_h_1=snapshot.p4_port1_next_orifice_resistance_line_port_1.h,
-            port_2_m_flow=-snapshot.p4_port1_next_orifice_resistance_to_p4_flow,
-            connected_h_2=snapshot.p4_port1_far_primary_line.h,
+        ) = self._two_state_connection_line_derivatives(
+            line=self.components.p4_port1_next_orifice_resistance_line,
+            port_1_properties=snapshot.p4_port1_next_orifice_resistance_line_port_1,
+            port_1_flow=snapshot.p4_port1_next_orifice_resistance_node_to_line_flow,
+            port_2_connected_properties=snapshot.p4_port1_far_primary_line,
+            port_2_flow=-snapshot.p4_port1_next_orifice_resistance_to_p4_flow,
         )
         (
             p4_port1_next_orifice_resistance_chamber_inlet_derivative,