diff --git a/tutorials/sphereGranFlow/RotaryAirLockValve/caseSetup/interaction b/tutorials/sphereGranFlow/RotaryAirLockValve/caseSetup/interaction
index f25783ff..71582f32 100644
--- a/tutorials/sphereGranFlow/RotaryAirLockValve/caseSetup/interaction
+++ b/tutorials/sphereGranFlow/RotaryAirLockValve/caseSetup/interaction
@@ -33,7 +33,6 @@ model
    
     /*
         Property (sphereMat-sphereMat  sphereMat-wallMat
-                                       
                                        wallMat-wallMat);
     */
    
@@ -49,9 +48,6 @@ model
     en    (0.70 0.80                             // coefficient of normal restitution
                 1.0);
 
-    et    (1.0 1.0                               // coefficient of tangential restitution
-               1.0);
-
     mu    (0.3 0.35                              // dynamic friction
                0.35);