diff --git a/tests/TestCommD3Q19.cpp b/tests/TestCommD3Q19.cpp
index 73b14ec9..12adbb73 100644
--- a/tests/TestCommD3Q19.cpp
+++ b/tests/TestCommD3Q19.cpp
@@ -6,7 +6,7 @@
 #include <iostream>
 #include <fstream>
 #include "common/ScaLBL.h"
-#include "common/MPI_Helpers.h"
+#include "common/MPI.h"
 
 using namespace std;
 
@@ -166,8 +166,8 @@ int main(int argc, char **argv)
 	// Initialize MPI
 	Utilities::startup( argc, argv );
 	Utilities::MPI comm( MPI_COMM_WORLD );
-        int rank = comm.getRank();
-        int nprocs = comm.getSize();
+    int rank = comm.getRank();
+    int nprocs = comm.getSize();
 	int check;
 	{
 
@@ -262,14 +262,14 @@ int main(int argc, char **argv)
 				}
 			}
 		}
-		MPI_Allreduce(&sum_local,&sum,1,MPI_DOUBLE,MPI_SUM,comm);
+		sum = comm.sumReduce( sum_local );
 		double iVol_global=1.f/double((Nx-2)*(Ny-2)*(Nz-2)*nprocx*nprocy*nprocz);
 	    	porosity = 1.0-sum*iVol_global;
 		if (rank==0) printf("Media porosity = %f \n",porosity);
 		//.......................................................................
 
 		//...........................................................................
-		MPI_Barrier(comm);
+		comm.barrier();
 		if (rank == 0) cout << "Domain set." << endl;
 		//...........................................................................
 
@@ -354,7 +354,7 @@ int main(int argc, char **argv)
 		GlobalFlipScaLBL_D3Q19_Init(fq_host, Map, Np, Nx-2, Ny-2, Nz-2, iproc,jproc,kproc,nprocx,nprocy,nprocz);
 		ScaLBL_CopyToDevice(fq, fq_host, 19*dist_mem_size);
 		ScaLBL_DeviceBarrier();
-		MPI_Barrier(comm);
+		comm.barrier();
 		//*************************************************************************
 		// First timestep
 		ScaLBL_Comm.SendD3Q19AA(fq); //READ FROM NORMAL
@@ -377,8 +377,8 @@ int main(int argc, char **argv)
 
 		//.......create and start timer............
 		double starttime,stoptime,cputime;
-		MPI_Barrier(comm);
-		starttime = MPI_Wtime();
+		comm.barrier();
+		starttime = Utilities::MPI::time();
 		//.........................................
 
 
@@ -397,13 +397,13 @@ int main(int argc, char **argv)
 			//*********************************************
 
 			ScaLBL_DeviceBarrier();
-			MPI_Barrier(comm);
+			comm.barrier();
 			// Iteration completed!
 			timestep++;
 			//...................................................................
 		}
 		//************************************************************************/
-		stoptime = MPI_Wtime();
+		stoptime = Utilities::MPI::time();
 		//	cout << "CPU time: " << (stoptime - starttime) << " seconds" << endl;
 		cputime = stoptime - starttime;
 		//	cout << "Lattice update rate: "<< double(Nx*Ny*Nz*timestep)/cputime/1000000 <<  " MLUPS" << endl;
@@ -429,5 +429,6 @@ int main(int argc, char **argv)
 	comm.barrier();
 	Utilities::shutdown();
 	// ****************************************************
+
 	return check;
 }
diff --git a/tests/TestDatabase.cpp b/tests/TestDatabase.cpp
index d32c5bff..c3341aab 100644
--- a/tests/TestDatabase.cpp
+++ b/tests/TestDatabase.cpp
@@ -9,7 +9,7 @@
 
 #include "common/UnitTest.h"
 #include "common/Utilities.h"
-#include "common/MPI_Helpers.h"
+#include "common/MPI.h"
 #include "common/Database.h"
 #include "ProfilerApp.h"
 
diff --git a/tests/TestSegDist.cpp b/tests/TestSegDist.cpp
index 97f1b8de..58f7a4a3 100644
--- a/tests/TestSegDist.cpp
+++ b/tests/TestSegDist.cpp
@@ -97,13 +97,13 @@ int main(int argc, char **argv)
         }
     }
 
-    MPI_Barrier(comm);
+    comm.barrier();
     if (rank==0) printf("Initialized! Converting to Signed Distance function \n");
 
-    double t1 = MPI_Wtime();
+    double t1 = Utilities::MPI::time();
     DoubleArray Distance(nx,ny,nz);
     CalcDist(Distance,id,Dm,{false,false,false});
-    double t2 = MPI_Wtime();
+    double t2 = Utilities::MPI::time();
     if (rank==0)
         printf("Total time: %f seconds \n",t2-t1);
 
@@ -115,7 +115,7 @@ int main(int argc, char **argv)
             }
         }
     }
-    err = sumReduce( Dm.Comm, err );
+    err = Dm.Comm.sumReduce( err );
     err = sqrt( err / (nx*ny*nz*nprocs) );
     if (rank==0)
         printf("Mean error %0.4f \n", err);
diff --git a/tests/TestTorus.cpp b/tests/TestTorus.cpp
index ee9789e1..ff412c39 100644
--- a/tests/TestTorus.cpp
+++ b/tests/TestTorus.cpp
@@ -172,10 +172,10 @@ int main(int argc, char **argv)
     double Ai = Object->A();
     double Hi = Object->H();
     double Xi = Object->X();
-	Vi=sumReduce( Dm->Comm, Vi);
-	Ai=sumReduce( Dm->Comm, Ai);
-	Hi=sumReduce( Dm->Comm, Hi);
-	Xi=sumReduce( Dm->Comm, Xi);
+	Vi=Dm->Comm.sumReduce(  Vi);
+	Ai=Dm->Comm.sumReduce(  Ai);
+	Hi=Dm->Comm.sumReduce(  Hi);
+	Xi=Dm->Comm.sumReduce(  Xi);
 	printf("Vi=%f, Ai=%f, Hi=%f, Xi=%f \n", Vi,Ai,Hi,Xi);
 
   } // Limit scope so variables that contain communicators will free before MPI_Finialize