Arizona Plumbing Practice Exam

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What color strip is used to mark hard drawn type L copper tubing?

  1. Red

  2. Blue

  3. Green

  4. Yellow

The correct answer is: Blue

The color strip used to mark hard drawn type L copper tubing is blue. In plumbing and piping, color coding is an essential system used to identify different types of materials and their specifications. Type L copper tubing is designed for lower pressure applications and is thicker and more durable than type M but thinner than type K. The blue color strip specifically designates that the copper tubing can be used in various applications, including water supply and gas lines. This standardization helps prevent confusion on job sites and ensures that the correct materials are used for specific plumbing tasks.

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