Product Specifications:

PVC Tube data sheet...>

The CMR PVC tube is made for sensing
air pressure and air volume.in industrial
applications. It is approx 8mm O/D and
4.7mm I/D.and is ideal for Industrial cable
tray Installation. It is described as being
8 x 1.5 which means 8mm O/D and 1.5mm
wall thickness.