An apparatus to enable the flow of high speed gases through the apparatus, the apparatus including modifying a metal hose which can be a metal hose or a corrugated metal hose having an exterior braid and an interior liner. The improvement includes inserting a non-bendable flange insert into a leading edge of the metal pipe and combining that with a pipe having a tapered interior wall which is welded to the metal hose to facilitate the flow of gases to a level of Mach 1 without damaging the interior portions of the interior liner.