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02-19-2005, 11:14 
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for underground. Constant moisture on the outside of the pipe attacks the glue, and that it's under pressure (sprinkler system) doesn't help. Is your underground piping under pressure? If not then I wouldn't worry. I was working next to a plumbing supply house and they knew what I was working on so they gave me the heads-up. As I recall, the glue was green-colored probably for inspection purposes (the primer was clear), not clear like aboveground (purple color is also for inspection but it's for the primer). I use the term "glue" because the fittings weren't "welded" together becoming one material. I found that the pipe fittings were not made of the same, identical material (pipe has small airbubbles in it from the foaming process when it's extruded the fitting are molded and have no detectable air bubbles). I found this out when I mis-fitted some pipe to the existing fittings; I used a propane torch to CAREFULLY burn or melt the old pipe and the fitting was ok!--it didn't melt as fast. So the joint was "glued" together rather than "welded".