What component restricts the flow of fuel in the control tubing of the 302AF fueling/defueling valve?

The component that restricts the flow of fuel in the control tubing of the 302AF fueling/defueling valve is the pressure reducing control (CRD). This component is specifically designed to regulate the pressure of the fuel flow and limit the amount of fuel that can pass through to ensure that it does not exceed the desired levels. By doing so, it helps maintain safe and efficient operation during the fueling and defueling processes.

The pressure reducing control works by adjusting the fuel pressure to a predetermined level, which is crucial for preventing over-pressurization that could lead to spills or system damage. Additionally, this component aids in ensuring that the fuel flow remains consistent and controlled, essential for operational integrity.

Other options may involve filtration or additional control functions, but they do not primarily serve the purpose of restricting flow in the manner that the pressure reducing control does. The focus on pressure regulation makes the pressure reducing control (CRD) the correct choice in this context.