A rotational joint is provided for an agricultural machine having hinged framesections,each frame section carrying one or more plumbing lines for moving a carrierfluid. Therotational joint includes first and second joint parts. Each joint part has acoupler defininga flow passage leading to an interface opening. The joints parts are coupledto allow forrelative rotation about a rotation axis passing through the interfaceopenings. In at leastone angular orientation of the joint parts, the flow passages of the couplersare in fluidcommunication.
