An apparatus for sealing a section of a pipe interior includes a clamp having a magnetic engagement means for axially positioning the clamp within the interior of a pipe and preventing relative axial movement there-between and a sealing plate securable thereto. Movement of the sealing plate against the clamp results in deformation of a resilient sealing member thereby forming a seal between the apparatus and the pipe. The apparatus can be used in conjunction with another oppositely oriented apparatus or other sealing means to form a sealed space within the tube. Pressurization of the sealed space allows for a radial and/or axial force being applied to the sealed section of the pipe.