Abstract: Improved method and apparatus for automatically adjustably sealing the exposed end portions of the vacuum slot of a vacuum extractor pipe of vacuum extraction equipment over which a running length of web material is passed for vacuum removal of materials therefrom, comprising an elongate flexible element anchored at one end in fixed position adjacent the end of the vacuum pipe slot with the element extending inwardly of the end to overlie and sealingly engage the end portion of the slot, and fluid-actuated motor means operatively attached to other end of the flexible element for exerting a pulling force thereon to lift the element from sealing engagement with the end portion of the slot.