While we can not definitively say how or when we originally happened upon this, we do know that it came from the National Group On Leak Detection Evaluations and a great guide for general reference in order to identify various types of nonmetallic piping commonly found in UST systems. They seem to be quite the dedicated independent group of state and federal employees whose full time job is to regulate storage tanks for their agency’s regulatory program.
The NWGLDE website is chock-full of resources including the January 2008 Nonmetallic Pipe Identification Guide.
Please note: Not all of the nonmetallic pipe systems that are or have been manufactured are included in this guide for several reasons but it sure is handy nonetheless!!
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