Abstract: A rotational manifold assembly (150) for providing fluid communication between rotatable parts such as a fixed and rotatable part of a rotatable building, the manifold assembly (150) comprising an innner member (162) located within an outer member (163) and defining a fluid chamber (167) therewith. A fluid supply line (168) is connected to the outer member (163) and communicates via a passage (166) with the chamber (167) and a fluid outlet line (176) is connected to the inner part (162) through a passage (173) such that the lines (168) and (176) communicate through the chamber (167). The inner member (168) is fixed for rotation to a hollow member (177) which may also comprise a fluid communication line or contain a fluid communication line. A rotatable building incorporating a rotational manifold assembly (150) is also disclosed.