| Answer | Crossword Clue |
|---|---|
| ELLS | Pipe or conduit elbows |
| risers | vertical pipe, duct, or conduit |
| riser | vertical pipe, duct, or conduit |
| conduits | CONDUIT, a channel or pipe, also CULVERT |
| ELLS | Pipe elbows |
| header | conduit (as an exhaust pipe for a many-cylindered engine) into which a number of smaller conduits open |
