Polyurethane Lightness - 9 times lighter than copper tublings.
Rubber like flexibility over a wide range of temperature and hence radii of curvature can be very small withour flattening which causes loss of pressure.
Resistance of all types of weathering.
Polyurethane (PU) has Excellent resistance to oils, grease, aliphatic hydrocarbons, oxygen and ozone.
Good resilience which allows repeated mounting on to the connecting pieces. (cutting off is not required)