Abstract: An expandable pipe stopper for inserting within a pipe having two rigid circular plates adapted to be inserted wholly within a pipe and an outwardly-expandable flexible seal located between peripheral surfaces of the plates so as to be capable of expanding radially. A projection is rigidly secured to or integral with a first of the plates and extends slideably through an aperture defined by the second plate. The stopper also includes a lever pivotable about an axis through the projection and cam means rigidly secured to or integral with the lever such that the lever is pivotable between a first orientation in which the flexible seal is relatively undistorted and a second orientation in which the cam means force the plates towards each other so as to axially compress and radially expand the seal for engaging with sealing contact with the wall of a pipe. A member is rigidly secured to or integral with part of a remote peripheral surface of one of the plates.

Abstract: An expandable pipe stopper for inserting within a pipe having two rigid circular plates adapted to be inserted wholly within a pipe and an outwardly-expandable flexible seal located between peripheral surfaces of the plates so as to be capable of expanding radially. A projection is rigidly secured to or integral with a first of the plates and extends slideably through an aperture defined by the second plate. The stopper also includes a lever pivotable about an axis through the projection and cam means rigidly secured to or integral with the lever such that the lever is pivotable between a first orientation in which the flexible seal is relatively undistorted and a second orientation in which the cam means force the plates towards each other so as to axially compress and radially expand the seal for engaging with sealing contact with the wall of a pipe. A member is rigidly secured to or integral with part of a remote peripheral surface of one of the plates.