Quick-connect fittings have a ______ valve built in.

• A. Directional control
• B. Relief
• C. Check
• D. Flow Control

Answer: (C)

Quick-connect fittings are designed for fast, clean connections in hydraulic lines, and many include a small one-way valve. That one-way valve is a check valve: it lets fluid flow through when connected and pressurized in the intended direction, but it prevents reverse flow or fluid loss when the connector is disconnected or under pressure changes.

This built-in check keeps the system primed and protects against spillback or contamination. Directional control, relief, and flow control valves are separate components that perform different functions, not a built-in feature of the connector itself.