Workers in this unit group assemble, fit, install and repair plumbing fixtures, pipes and pipeline systems. Their functions include: cutting, bending, jointing, assembling, installing and maintaining pipes, fittings and fixtures of drainage, heating, water supply and sanitary systems; assembling, installing and maintaining pipeline systems in buildings, industrial plants, ships and aircraft; performing related tasks. Lead burner and Brazer are classified in unit group 8-72.