17 PIPES, NAMELY, PLASTIC PIPES FOR PLUMBING PURPOSES, CANVAS HOSE PIPES; CYLINDER JOINING SEALS; PACKING MATERIAL FOR FORMING SEALS FOR USE IN PLUMBING, DRAINAGE AND OTHER WATER DISTRIBUTION SYSTEMS; RINGS OF RUBBER FOR USE AS PIPE CONNECTION SEALS; ADHESIVE SEALANTS FOR GENERAL USE; SEALANTS FOR PAVEMENTS; CYLINDER JOINTING SEALS; JOINTING MATERIAL FOR MASONRY AND PAVEMENT; COMPRESSED AIR PIPE FITTINGS, NOT OF METAL; TUBULAR PLASTIC PLUMBING PIPING FOR USE AS LAVATORY WASTE OUTLET; EXPANSION PIPING; PLASTIC CONDUIT FOR PLUMBING USE, NAMELY WATER DISTRIBUTION OR THE DISCHARGE OF WATER OR SEWAGE