polybutylene or PEX

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themcnabs

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I have a home built in 1992. Is this polybutylene or PEX? I took the shower valve cover off and took this photo.

1.jpg
 
I don't know, but PEX was pretty much unknown in 1992. Wirsbo expansion fittings definitely weren't around at that time.

ProPEX® ASTM F1960 expansion fittings were introduced in 1992. My photo shows F1960 on the fitting. What are the chances it is original?
 
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