| 138 / | HD | PIPES AND TUBULAR CONDUITS |
| 118 | | FLEXIBLE {8} |
| 118.1 | DF | .~> Casing |
| 119 | DF | .~> With means for facilitating collapse |
| 120 | DF | .~> Joined sections |
| 121 | DF | .~> Corrugated {1} |
| 123 | DF | .~> Braided, interlaced, knitted or woven {1} |
| 128 | DF | .~> Longitudinally seamed |
| 129 | DF | .~> Spirally wound material {4} |
| 137 | DF | .~> Distinct layers {2} |