A nozzle is provided which includes a nozzle body having a proximal end and an insertion end and defining an inlet orifice at the proximal end thereof and an outlet orifice at the insertion end thereof. An assembly can include threadedly coupled components having inner and outer sealing members in grooves. In addition, a mechanism is provided for adjustably controlling the movement of the at least one valve in order to provide a variable amount of opening of the at least one valve in the open position. The ring member accommodates the shaft portion and can rotate about the axial center of the shaft portion. The capacitor-embedded PCB includes a dielectric layer, a lower electrode layer formed under the dielectric layer, and an upper electrode layer formed on the dielectric layer and configured to have at least one first blind via hole that is inwardly formed. Magnetic recording heads and disc drives that record data in accordance with the method are also included.