Which actions help detect leaks after charging a line?

• A. Observe Couplings for Moisture
• B. Listen for Hissing
• C. Verify Pressure on the Gauge
• D. All of the Above

Answer: (D)

After charging a hose line, you want to confirm there are no leaks and the line stays at the intended pressure. Visually checking the couplings for moisture can reveal a leak at a connection, since water will bead or dampen around a loose or damaged joint. Listening for a hissing sound helps detect air escaping along the hose or fittings, which signals a leak or a poor seal. Verifying the pressure on the gauge shows whether the line is maintaining the set pressure; a steady drop indicates a leak somewhere along the line. Using all three checks together covers different leak signs—visible moisture, audible escape, and pressure loss—giving the most reliable detection after charging.