A printhead integrated circuit that has a plurality of nozzles formed on a frontside of a monolithic wafer substrate, the nozzles being arranged in rows extending longitudinally along the substrate. The label has a flanged thermoplastic knob extending above a rectangular flange with a longitudinal axis and a transverse axis perpendicular to the longitudinal axis. The bottom layer has a flow rate FB of fluid therethrough and the top layer has a flow rate FT, where FB<FT, and the spacing layer maintains a space between the top and layers to permit flow of fluid therein to distribute the fluid.