I'd understand either of those, but I'd go with "tubing"

https://www.3m.com/3M/en_US/p/c/electrical/wire-cable/tubing...

That's heat shrink tubing, but we're talking about one of these:

[1]: https://www.holley.com/products/engine/engine_dress_up/hoses... [2]: https://www.oreillyauto.com/detail/c/dorman-conduct-tite/lig...