A one-piece manifold for use in a sprinkler valve assembly includes an intake pipe having a water inlet and a plurality of ports adapted for fluid connection to inlets of a plurality of respective sprinkler valve assemblies. An outlet is attached to the intake, such as by cross-beams, and includes a plurality of elbow segments which are non-fluidly connected to one another. Each elbow segment defines an intake port adapted to be fluidly connected to an outlet of the respective valve assemblies. An exhaust port is adapted to be fluidly connected to a sprinkler or irrigation line. Preferably, the manifolds are connectable to one another in series to accommodate any number of sprinkler lines.