6
Pipe and tubes of metal, as well as parts and fittings therefor; fittings of metal for pipes and tubes; fittings of composite materials (mainly of metal) for pipes and tubes
11
Sewage purification apparatus; Liquid waste purification system, chambers, parts and components for aforesaid goods and systems
17
Flexible plastic pipes tubes; insulation materials for pipes; fittings of plastic for pipes and tubes; rubber rings, insulation elements for pipes and tubes, flexible sewer pipes of plastic material, parts and fittings for all the aforesaid goods, all included in this class; pipe sleeves of plastic, pipe bend of plastics, as well as insulating parts for pipes and floors, as well as parts, fittings and accessories for all the aforesaid goods; cable protection piping; manifolds of plastic
19
Non-metallic rigid pipes and chambers as well as parts, fittings and accessories for all the aforesaid goods; Non-metallic rigid pipes, tubes and chambers of plastic material; Non-metallic rigid pipes, tubes and chambers of concrete material
37
Building construction; service for the repair and installation of pipes and tubes and service and installation of sewers, and liquid waste purification systems