NOVELTY - A unitarily removable molding apparatus (100) having at least four elongated surfaces comprises first elongated surface (110) separated from second elongated surface (120); several coplanar aligned and spaced hollow pockets (111) descended from first surface to descended surface shorter in depth than separated thickness from first surface to second surface; several coplanar aligned and spaced projections, and passage between each descended surface of hollow pockets to elongated passage within or upon second surface; and third elongated surface separated from fourth surface.    USE - As unitarily removable molding apparatus (claimed); for hermetically enjoining elongated hollow polymeric fluid flow distributing manifolds over polymeric extruded structures having a multiplicity of spaced planar aligned hollow conduits; for making heat exchangers e.g. solar collectors.    ADVANTAGE - The molding apparatus functions as a cycle by cycle removable multi-purpose mold within a mold. The apparatus is consequently mechanically extracted and repeatedly reused for ongoing mold cycles. The apparatus is particularly useful for hermetically enjoining elongated hollow polymeric fluid flow distributing manifolds over polymeric extruded structures having a multiplicity of spaced planar aligned hollow conduits. The unitarily removable molding apparatus enhances both manufacturing efficiency and hermetic enjoinment durability, most especially when over molding onto connectively spaced tube absorber constructions. The method enables much more favorable higher temperature and pressure molding conditions. Even more, it enables an enlarged radius on the scalloped surface contour, providing a more forgiving crevice to push the molten material into. This all provides a very significant enhancement to the hermetic enjoinment manufacturing efficiency and end product durability. The method is cost effective, and significantly enhances the effectual displacement of air and thermally induced gas but to also impede the formation of thermally induced gas; maximizes the area of enjoinment and enhances the fusibility of the formed manifold to extruded substrate surface. The apparatus provides a particular benefit to the effective polymeric displacement of air and gas within the mold cavity. Its design and use functionality in this regard is multifaceted. The apparatus enhances the strength and inherent integrity of hermetically enjoined manifold to absorber connections.    DETAILED DESCRIPTION - A unitarily removable molding apparatus (100) having at least four elongated surfaces comprises a first elongated surface (110) separated from a second elongated surface (120); several coplanar aligned and spaced hollow pockets (111) descended from first surface to a descended surface shorter in depth than separated thickness from first surface to second surface; several coplanar aligned and spaced projections extending beyond first surface from or preferably through descended surface of hollow pockets, where each projection has a common center with one hollow pocket, and at least one passage is provided between each descended surface of hollow pockets to an elongated passage within or upon second surface; and a third elongated surface separated from a fourth elongated surface. The unitarily removable molding apparatus further comprises a subassembly comprising a multi-conduit fluid passage; and a second unitarily removable molding apparatus having projections. The unitarily removable molding apparatus is formed of VascoMax C-250 (RTM: nickel alloys). An INDEPENDENT CLAIM is included for molding an elongated hollow plastic manifold over each end of a subassembly of a multi-conduit fluid passage to form at least a portion of solar collectors involving hermetically enjoining elongated hollow plastic manifold to each end of extrusion component or components; placing a unitarily removable molding apparatus on one end of subassembly into a manifold mold, where manifold mold has a multiplicity of air/gas vent opening along one entire cavity mold parting side, and has an automatically driven manifold mold core having an elongated slot, driving the manifold mold core over a mold staged unitarily removable molding apparatus; positioning a first surface of unitarily removable molding apparatus recessed below an outer diameter of the manifold mold core; positioning extrusion component or components of the subassembly within extrusion component or components matching outer contour mold cavity shut-off positioned at a mold cavity parting side opposite the parting side with air/gas vent openings, where the mold cavity is closed and externally force loaded; injecting pre-conditioned molten plastic into one end of elongated hollow manifold mold cavity; pressing, fusing, and forming the molten plastic around the extrusion component of components and into the open cavity areas as defined by hollow pockets and projections, cooling the formed elongated hollow manifold; opening the mold cavity; automatically pulling the manifold mold core; forming an elongated hollow manifold, the hermetically enjoined extrusion component or components, and the unitarily removable molding apparatus as having a portion of projections inserted inside the extrusion component or components, a portion of projections inside the formed elongated manifold, and a portion of formed elongated manifold inside the hollow pockets, mechanically extracting the unitarily removable molding tool from the solar collector or the solar collector segment. The pre-conditioned molten plastic contains cut glass fibers (15 wt.%) having an aspect ratio of 250:1 and is chemically coupled to the base polypropylene using maleic anhydride modified polypropylene coupling additive (1000 parts per million (ppm)). The extrusion component and an over molding component contain Dow Versify 2300 (RTM: elastomer) (3-6 wt.%).    DESCRIPTION OF DRAWING(S) - The figure shows a cross sectional centerline end view cut of the pre-assembled unitarily removable molding apparatus as inserted into the absorber tube ends and a as loaded into the manifold core slot of a manifold over molding vertically clamping mold.    Unitarily removable molding apparatus (100)    First surface (110)    Hollow pocket (111)    Second surface (120)    Elongated hollow channel. (122)