an injection molding apparatus comprising : an injection molding machine , a heated manifold , a nozzle , the downstream end of the nozzle comprising an inner tubular member having a central flow channel and an outer circumferential surface and an outer tubular member having an inner tubular surface , the outer tubular member forming a seal surrounding the gate , the inner and outer tubular members being adapted to form a sealed circumferential gap , the inner tubular member including one or apertures extending radially through the inner tubular member to route flow radially from the fluid flow channel into the circumferential gap .