It's commonplace here to use rubber sleeves but that's «above» grade in the basement. (biggerpockets.com)
There are four layers of material protecting the cable's wires: braided nylon, a TPE rubber sleeve, a tinned copper braid, and a grounding layer. (businessinsider.com)
This project includes the installation of a $ 1.1 Million 3D Suction Blow Molding machine for Hytrel ® and Zytel ® blow molding air ducts, as well as a rubber injection molding press and molds for Vamac ® rubber sleeve and molded air ducts. (dupont.com)