The Liquiduct is a pipe that will transport liquids without the use of a wooden pipe and engine. It does still require a redstone signal to work. A wrench can be used on the pipe where it connects to a liquid source to determine the direction of flow.
When you Crescent Hammer it will dismantle the pipe in order to be picked up as the pipes are very sturdy otherwise.+ "Right-Click" a conduit with the Wrench or
The following video, while mainly intended for explanation of Oil -> Fuel refinement process, makes heavy use of Liquiducts and contains numerous references to Liquiduct features and properties.