I am installing natural gas lines under a new patio for a BBQ and
fireplace.  I have received reccomendations from two sources.  One to
use traditional metal pipe and one to use polyethylene pipe.

I am looking for any resources that can give me the pros and cons of
using either pipe material.

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Clarification of Question by al610-ga on 26 Oct 2004 11:52 PDT

I believe the metal pipe was cast iron.  I am in southern California

It may make a difference which metal, copper, cast iron or other. Also
what is your location.   Neil