Polyfluorocarbon condenser plug

Claim 1

In a condenser plug for a condenser tube, the combination comprising: a cylindrical external tube body having a thermoplastic polymer composition adapted to thermoplastic cold flow extrusion and sealing at the condenser tube operational conditions, said tube body having a coaxial flat flange lip at one tube terminus and an integral plug base at the second tube body terminus, said tube body having a threaded bolt coaxially disposed inside said tube body, said threaded bolt having a bolt head disposed in said integral plug base and fixed in position, said bolt having a bolt terminus adaptively disposed substantially below the exterior face of said coaxial flat flanged lip of said tube body, said threaded bolt and said tube body adaptively sized to provide an annular cylinder volume there between, and, a cooperative metal expander bolt having a tapered insertion tip and an internally threaded sleeve adaptively providing a means of threading said threaded sleeve onto said bolt terminus, said expander bolt having a flat flange head whose diameter is not greater than the diameter of said coaxial flat flanged lip of said tube body, said expander bolt having an exterior bolt diameter adaptively sized to provide thermoplastic cold flow expansion and extrusion of said polymer composition to conform to the mechanical and thermal stresses for a specific cold flow sealing operation, sealing said condenser tube.