A high velocity impinger which passes 6 L/min (corrected to engineering standard gas conditions) when the pressure drop across the orifice is 41 cm Hg. or greater. Joint is 24/25. Capacity approximately 125 mL. Center tube is 11 mm O.D.; side is 8 mm O.D. with bulge. Tip of capillary stem is 4 mm from the flask bottom.