What does MANF stand for?

Manifold

A pipe or series of pipes connecting a series of ports to a common opening. A conductor with multiple connection ports, generally made from a solid block of metal with internally drilled passageways to minimize the amount of piping required.  A fabricated system of passages to which various components are attached to form a working assembly or subassembly. A term used mainly with reference to blow molding and sometimes with injection molding equipment.