Core tool around which resin-impregnated reinforcement is wound to form pipes, fittings and structural shell shapes.
Source: ISO 14692-1:2017, Petroleum and natural gas industries — Glass-reinforced plastics (GRP) piping — Part 1: Vocabulary, symbols, applications and materials, Second Edition, August 2017. Global Standards
Component(s) of a packer that contain(s) the end connections and provide(s) a conduit through the packer.
Source: API SPEC 11D1, Packers and Bridge Plugs, Upstream Segment, Second Edition, July 2009. Global Standards