Works with any ‘truck mount’ or portable machine (connected to a pressure washer). Concentrates all the water pressure through an amazing new spray jet that creates extreme force for cleaning severely soiled grout.  Works with pressure from 200 psi to 2000 psi.  Primarily used as a detail tool for corners or edges.  May be needed for some grout lines with extreme soiling.  A must-have-tool for anyone starting hard surface cleaning.