SIGMA ULTRAVAC industrial vacuum hose from Texcel has a polyurethane tube construction with abrasion resistance. It is lightweight with low-temperature flexibility, and is permanently conductive, with a conductive tube that prevents the buildup of static electricity. The complete vacuum transfer system needs to be grounded (earthed) to dissipate stray currents to earth, and also bonded so there is a continuous conductive path from the vacuum truck through the hose and nozzle to the tank or source container. A screw-down C-type clamp provides a metal-to-metal connection that is less likely to be accidentally knocked loose. 800/231-7116; www.texcelrubber.com.