Alan, I always thought it was something to do with the "great Chicago fire" and fire prevention from the introduction "newfangled electricity" at the turn of the previous century.
I think its a local thing just like in San Fransisco (I think that's the city) all plumbing including the DVW and sprinklers have to be plumbed in copper. No plastic or cast iron allowed.
Last edited by mbhydro; 08/17/10 08:53 PM. Reason: spelling
