a pipe manifold for utilization with hot water heating systems and including substantially adjacent inlet and return flow chambers within a single elongated box and separated by an internal dividing wall . disposed on the outside of the housing are pipe headers of various types , in particular frustoconical pipe headers , which may be cut off so that the diameter obtained matches that of a valve or pump or the like to be mounted thereto with the intent that the overall height of the apparatus is constant independently of the size of the attached device . the headers communicate with the chambers within the manifold via openings which are advantageously disposed at one or the other side of the edge of the dividing wall . a variety of embodiments is presented .