It would be very cool if a pipe was available that does not connect to inventories, but connects to other pipes, like the BuildCraft sandstone pipe, or a wrench that could remove connections to an inventory.

For example, I could craft any pipe together with some sand, which would give me a version of that pipe that would not connect to inventories.

Noted, thanks for the suggestion!

Rigid pipes have been added as of v1.1.0