Vacuum truck operators have complained for years about the typical steel or aluminum vacuum tubes.  They crush or get damaged too easily.  Worse, they conduct electricity so it's a little scary when hydro-excavating around power lines.

High density poly pipe, HDPE, eliminates those problems.  To start with wear and tear or   damage is almost eliminated because of the toughness of HDPE pipe.  Compared to steel, aluminum, or PVC a vacuum tube made from HDPE will last forever.  It won't crack or crush and you can't dent it.  Puncturing it is nearly impossible.  Wear from abrasion is greatly minimized as well.

Electrical conductivity so minimal that it can be considered an insulate.  Independent testing has shown only a slight trace (0.165 milliamps) of conductivity at 75,000 volts per foot.  No longer does a crew need to worry about electrocution when excavating around power wires.

However, HDPE is heavier than aluminum.  For example an 8" diameter 6' long PolyVac tube will weigh almost double a similar tube in aluminum.   Depending on the application, a crew will notice the weight difference.  So far all those who have tried PolyVac tubes are ordering more.  The resiliency of the PolyVac has proved more beneficial than the heavier weight.