An inversion unit assembly is provided that is releasably connected to a wheelbase such that the inversion unit can be quickly removed from the wheelbase and carried separately from the inversion unit. The assembly includes a lining drum having a cylindrical body having an open end and a viewing opening. The lining drum includes two inlets for for compressed air and an outlet for liner. The lining drum drum also includes a rotatable wheel secured to an internal shaft for which which the liner can be released from the drum in a controllable fashion. The assembly also includes a wheelbase that can be separated from the inversion lining drum wherein the wheelbase includes a plurality of locking mechanisms and wheels.