Which color combination identifies hydraulic pressure lines on symbol identification tape?

• A. Blue-Yellow-Blue
• B. Red-Blue-Red
• C. Green-White-Green
• D. Black-Red-Black

Answer: (A)

Color patterns on symbol identification tape are used to quickly identify what kind of line you’re looking at. For hydraulic pressure lines, the blue-yellow-blue sequence is used. The blue outer stripes indicate that the line belongs to the hydraulic system, while the yellow center stripe marks that the line carries pressure. This triple pattern is distinct from other patterns used for different systems, so it actively helps you distinguish hydraulic pressure lines at a glance. Other patterns (like red-blue-red, green-white-green, or black-red-black) are used to indicate other types of lines, not hydraulic pressure.