We visited a property recently, a penthouse on phase 3, where a furniture company were completing an install and drilling holes for the curtain pole brackets and they drilled through a water pipe
The location was left of the window, located outside the kitchen entrance
First of all I am amazed that there should be a pipe left of the window lintel, and I can only asume that it is the feed to the roof solarium
Unfortunatley this pipe cnnot be located by the normal sensors as it is a plastic pipe so please be carefull