37 Construction, inspection in the course of maintenance and maintenance of pipelines and hose systems and repair of pipelines and parts therefor, including branching pipes and manifolds for pipelines, pipe joints, pipe elbows, pipe bends, u-bends, adapters for pipes, junctions for pipes and hoses, pipe muffs and pipe support sleeves, clips for pipes, clamps for pipes and hoses, nuts and swivel nuts for pipes, bead chains for connecting pipelines, closures for pipes, valves for pipelines and hoses, couplings for pipelines and hoses, hose nozzles, seals for pipes, connecting flanges for pipes, cast parts for pipes and stop valves, cast iron parts for pipes, all of the aforesaid goods being repaired being of metal, tools and equipment using steam and compressed-air technology, steam guns, pipelines for sanitary purposes, pipeline cocks in the nature of spigots, pipes as parts of sanitary installations, steam-water mixing devices, and filter devices for conduits carrying fluid, including water, steam or gas; construction, inspection in the course of maintenance and maintenance of pipelines and hose systems and repair of pipes, junctions for pipes and hoses, branching parts for pipes, pipe couplings, pipe muffs, clips for pipes, joint pieces for pipes, clips of rubber for connecting pieces of pipes, rubber stoppers for pipelines, seals for pipes, for pipe connections, for pipe fittings, pipe sealant tape, rings of rubber for use as pipe spacers, rings of rubber for use as pipe connection seals, pipe sealant compounds for preventing rusting, casings of rubber for pipes, sleeves of rubber for pipes, pipe linings, including for sealing pipes, filtering materials being semi-processed foams or films of plastic, adaptors for pipes, not of metal, connecting flanges for pipes, cast parts for pipes and stop valves of plastic, elbow joints of plastic, all of the aforesaid goods being repaired not being of metal