Abstract: An apparatus for ensuring that the flute tips of a corrugated web receive a certain amount of glue before having the second liner thereto. The apparatus includes a hollow air bar, formed by an outside wall and two end caps, which replaces the conventional rider roll in the corrugating machine. A source of air, such as a pump, is connected to the air bar for supplying air to it. Air outlets on the side of the air bar facing the web allows the air to impact against the web and hold the web against the conventional applicator roll so that glue is applied properly to the flute tips of the web. Means are provided for directing the air escaping from the outlets more directly against the web, and for adjusting the effective length of the air bar to approximately match the width of the web being processed.