diff --git a/opm/core/pressure/IncompTpfa.hpp b/opm/core/pressure/IncompTpfa.hpp
index c670f611b..76ba73baa 100644
--- a/opm/core/pressure/IncompTpfa.hpp
+++ b/opm/core/pressure/IncompTpfa.hpp
@@ -72,6 +72,9 @@ namespace Opm
 		   std::vector<double>& pressure,
 		   std::vector<double>& faceflux);
 
+        /// Expose read-only reference to internal half-transmissibility.
+        const ::std::vector<double>& getHalfTrans() const { return htrans_; }
+
     private:
 	const UnstructuredGrid& grid_;
         const LinearSolverInterface& linsolver_;