6 METAL TUBES AND METAL TUBING; METAL TUBE CLAMPS; METAL TUBING COUPLERS AND CONNECTORS; METAL VALVES; ARTICLES OF METAL FOR USE IN OIL AND GAS WELLS, NAMELY, MANDRELS, COUPLINGS, SELF-MATING COUPLINGS, PRODUCTION LINERS, LINER HANGERS, CASINGS, SEAL ASSEMBLIES, AND A SELF-MATING COUPLING THAT HYDRAULICALLY CONNECTS A METAL CONDUIT ATTACHED TO A FIXED CASING TO A METAL CONDUIT ATTACHED TO A DEPLOYED LINER