diff --git a/tespy/connections.py b/tespy/connections.py
index c0bffdcbd..4183f9d07 100644
--- a/tespy/connections.py
+++ b/tespy/connections.py
@@ -271,8 +271,8 @@ def __init__(self, label, **kwargs):
 
     def set_attr(self, **kwargs):
 
-        self.label = kwargs.get('label')
-        self.P = kwargs.get('P')
+        self.label = kwargs.get('label', self.label)
+        self.P = kwargs.get('P', self.P)
 
         if not np.isnan(self.P):
             self.P_set = True