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With Curvy Pipes installed, the same Flowline pipes also place curved lines from the off hand. A Curvy line whose end sits on a Flowline pipe connects to that pipe's network.

One end still has to be set to Extract in Curvy's endpoint menu.

A curved line carries one thing, so with a Universal Pipe in the off hand the mode key cycles Build for me, Curvy: Items, Curvy: Fluids and Curvy: Energy. The line is laid in the chosen channel and paid for with universal pipes.