or hydraulic means supply the motive power to use and operate the system application_number US 18968794 A description referring to fig1 the invention generally comprises a cutter assembly 10 having an elongated frame and a leading end and a trailing end a plurality of cutter wheels 11 and 12 are mounted longitudinally in the cutter assembly with journals 11a and 12a respectively each cutter wheel 11 12 is mounted on a transverse axle in the journal 11a 12a to provide unencumbered rotational movement of each cutter wheel as best seen in fig2 the cutter wheels 11 12 are co aligned along the longitudinal axis of the cutter assembly 10 the first cutter wheel 11 cuts through the existing utility pipe 13 and scribes a scoring line on the existing utility pipe fittings 14 the second cutter wheel 12 cuttably engages the existing utility pipe fittings 14 within the scoring line and cuts the existing utility pipe fittings 14 along the scoring line the second cutter wheel 12 does not cut through the utility pipe 13 but only cuts through the utility pipe fitting 14 the cutter assembly 10 also includes a plurality of pipe expanders 15 and 16 that fractionally and frictionally contact the interior wall of the utility pipe the distance.