Taco In Line Air Separators are applied in commercial, institutional and industrial applications for the removal of free air in water or water/glycol systems. The In Line designed air separator utilizes the advantages resulting from large body diameter in relation to the entering nozzle diameter. The design of in line air separators depends upon the lowering of the system fluid velocity within the separator the change in direction of fluid flow within the unit, and buoyant force direct air to the automatic air vent normally positioned at the top of the separator.