PRD Failure
I doubt it would be a surge of water pressure and if it was there is nothing you can reasonably do to prevent it.
Sometimes these things just go!
http://www.showerdoc.com/TRITO-83301330-PRD-(Pressure-Relief-Device)-and-'O'-ring-(Pair)?ss=prd&pg=2
Answered 13 years ago by The Shower Doctor
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