A fixed nozzle pump appropriate for food service and dispensing of other fluids of varying viscosities is contemplated. The components are modularly connectable for easy assembly and cleaning. A piston and sealing ring cooperate with the chamber extension formed in the pump body to facilitate reciprocating pump action while minimizing the number of components disposed in and exposed to the fluid flow path. A novel, injection-moldable valve is integrated on the dispensing nozzle. The entire assembly may be disposed within a container shell which itself includes a replaceable pouch filled with the fluid to be dispensed.