The Screw,tapping,4x10 is the lowest priced item on this Air Intake Duct/solenoidv Alve schematic.
In this schematic the "Screw,tapping,4x10" is used most often.
Some items from this specific schematic: Tube,3.5x30, Screw,tapping,4x10, Duct,r Air, Duct,r Air.