Originally Posted by big john

If they're flexible you can call them a hose.
When ordering parts or looking stuff up in service information it can be difficult to figure out what GM called it. It could be a hose, a pipe, a tube, a duct, a fitting, or even a harness. The other weird thing is parts have different names in service documents than they do in parts information sometimes. Even with the computers it can take the parts department a while to figure out what service is asking for and how to look it up.