FAA AMT Airframe Practice Exam 2025 – Complete Exam Prep Guide

A valve is a device that controls the flow of fluid or gas. While it may have a sealing element, its primary function is to regulate the flow, not act as a flexible sealing element subject to motion.

A connector is a type of fitting that joins two components together, but it is not typically flexible or subject to motion.

A hose is typically a flexible tube used to convey fluids or gases, but it may not necessarily have a sealing element.

Therefore, the best answer is B Packing, which is a flexible sealing element commonly used in valves, pipes, and pumps to prevent leakage.