"One who furnishes, fits, and repairs lead, iron, glass or plastic pipes, and other apparatus for the conveyance of water, gas or drainage..."
The materials mentioned above could be revised. I think that copper is the most common material for water pipes here in Sweden, and water pipes made from lead are probably rare because of the risk for lead-poisoning?
Best Regards Lars Melin
Water pipes made from lead are indeed rare these days for that reason, but they were not in the past, and there is a school of history which argues that the Roman Empire fell because of lead pipes: the Romans had plumbers, too – and indeed the word "plumber" literally means "lead-worker".
There is a need in this article for some modern strongly-linked metaphorical uses of the word to be covered, eg in the financial markets and in secret intelligence (according to Le Carré, anyway!). Deipnosophista (talk) 09:04, 26 February 2015 (UTC)