Sincerely Sewer

From: <Paul>
Date: Fri Dec 15 2006 - 20:01:00 EST

While browsing through Pipeline Rules of Thumb (ISBN 0750674717), I noticed this odd marking symbol for buried sewer piping:

Is this a digital copy-paste/printing error or an inside joke in the sewer industry?

Paul Received on Fri Dec 15 20:01:00 2006

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