What is the name of the valve located inside a quick-connect fitting?

• A. Poppet valve
• B. Check valve
• C. Needle valve
• D. Ball valve

Answer: (B)

This question is about the function of the valve built into a quick-connect fitting. The internal valve is there to stop flow in the reverse direction and to seal the line when the connection is disconnected. That one-way behavior is exactly what a check valve does: it opens to allow flow in the intended direction but blocks it if the flow would go backward, preventing leakage and pressure loss when the halves aren’t connected.

A poppet valve is a sealing element that can be part of various valves, but the distinct role inside a quick-connect is the unidirectional flow control provided by a check valve. A needle valve is for fine throttling, and a ball valve shuts off flow with a ball mechanism—neither matches the typical purpose of the quick-connect’s internal component, which is to prevent backflow while allowing quick, secure connection.