Abstract: A dual-operating mode stage collar adapted to form part of a conduit string positionable in a well bore. Included is a tubular body having a side port with inner and outer openings. A first sleeve is axially shiftable relative to the body during one operating mode inside the body from one position closing the inner opening toward another position exposing it. A second internal sleeve is connected to an outer-port-closing slide through an aperture in the body and is axially shiftable as a unit relative to the body in a second operating mode from a position in which the slide and second sleeve are remote from the port toward another position in which the slide covers the outer port opening. In the preferred embodiment, the second sleeve covers the inner port opening as the slide covers the outer port opening.