there is disclosed apparatus for rotationally casting a plastic liner for a pressure vessel having a metal access fitting molded therein . the apparatus includes a rotational casting arm having a mold supporting surface and adapted to be rotated about orthogonal axes . a hollow mold having a mold cavity surface conforming to the outside surface of the liner to be molded is removably attached to the mold supporting surface together with a metal access fitting . the metal access fitting has a longitudinal axis aligned with one of the orthogonal axes and has at least a first surface portion extending into the mold cavity . the first surface portion and the surface of the mold cavity are coated with plastic upon mold rotation to form the plastic liner .