1. . 
An arrangement of piping or valves designed to control, distribute and typically monitor fluid flow. Manifolds are often configured for specific functions, such as a choke manifold used in well control operations, a frac manifold for directing treatment fluid, and a squeeze manifold used in squeeze-cementing work. In each case, the functional requirements of the operation have been addressed in the configuration of the manifold and the degree of control and instrumentation required.
2. . 
A common pipe or chamber having several lateral outlets.