method of fabricating a polymeric tube for attachment to a prefabricated tubular polymer body comprising : selecting an ethylene copolymer functionalized with a conjugated vinyl moiety , and coextruding an outer tubular layer comprised of the selected functionalized ethylene copolymer together with at least one inner tubular layer comprised of a thermoplastic elastomeric material to form a mating tube having an outer surface comprised of the functionalized ethylene copolymer , a central tubular passage having a longitudinal axis and opposing ends .