Rib and groove fastener structure

Claim 1

A ONE PIECE MULTI-WALL TUBE, COMPRISING FLEXIBLE TUBULAR STRIP STRUCTURE OF EXTENDED LENGTH HAVING SPACED WALL PORTIONS WITH THE SPACED WALL PORTIONS BEING JOINED TOGETHER BY LINKING WALL SPACERS INTEGRAL WITH THE WALL PORTIONS, SAID FLEXIBLE STRIP STRUCTURE HAVING FASTENER STRUCTURE AT OPPOSITE ENDS OF ONE OF THE WALL PORTIONS EACH FASTENER STRUCTURE INCLUDING COMPLEMENTAL EDGE STRUCTURE HAVING INCLINED ADJACENT RIBS AND GROOVES EXTENDING ALONG THE STRIP LENGTH WHICH RIBS AND GROOVES ARE HOOK-LIKE IN CONTOUR IN SECTION AND IN DETACHABLE LOCKING INTER-ENGAGEMENT TOGETHER FORMING A MULTI-WALL TUBE, THE MEDIAN PLANES OF SAID RIBS AND GROOVES SLOPING AT AN ANGLE TO THE PLANE OF SAID STRIP SUCH THAT THE HOOK-LIKE RIBS SLANT IN THE DIRECTION OF THEIR FREE ENDS INWARDLY TOWARD THE TUBULAR STRIP STRUCTURE TO INCREASE THE RESISTANCE TO SEPARATION OF THE INTERENGAGED FASTENER STRUCTURES, SAID TUBULAR STRIP STRUCTURE INCLUSIVE OF SAID FASTENER STRUCTURES BEING INTEGRAL AND COMPOSED OF A SUBSTANTIALLY WATER-AND MOSITURE-PROOF PLASTIC MATERIAL HAVING HIGH DIELECTRIC STRENGTH.