diff --git a/tcl/drivers/ccu4.tcl b/tcl/drivers/ccu4.tcl
index 1acafda..a4e3ec4 100644
--- a/tcl/drivers/ccu4.tcl
+++ b/tcl/drivers/ccu4.tcl
@@ -287,6 +287,10 @@ proc stdConfig::ccu4 {{title CCU4} args} {
     prop label "N2 threshold"
     prop avnode nav
     
+    node ntf out
+    prop label "N2 fill threshold"
+    prop avnode nav
+    
     node ntc out
     prop label "N2 tube cool delay"
     prop avnode nav