Abstract: An apparatus and process for manufacturing a thermoplastic tube headpiece adapted to be fused with a tubular body sleeve and having a fully molded sealing surface and concentric orifice. Male and female members cooperate so as to define a cavity corresponding in shape to the headpiece, maintain the male member in a concentric position within the neck portion of the headpiece cavity and form a passageway. The passageway conveys thermoplastic material received from a sprue in the female member through a sidewall opening and into the cavity. A projection of solidified thermoplastic material corresponding in shape to the sprue and passageway is severed from the sidewalls.