What is the term for a person learning the plumbing trade under the supervision of a licensed master plumber?

The term for a person learning the plumbing trade under the supervision of a licensed master plumber is "apprentice." An apprentice is an individual who is undergoing training to gain practical experience and theoretical knowledge in plumbing. This learning phase is essential for developing the skills needed to eventually become a licensed plumber.

The apprenticeship typically involves a combination of hands-on work experience and classroom instruction, allowing the apprentice to learn about plumbing systems, codes, tools, and safe practices directly from an experienced professional. This structured education is crucial for anyone aspiring to advance in the plumbing field.

In contrast, a journeyman is someone who has completed an apprenticeship and is qualified to work independently but has not yet obtained a master plumber license. A master plumber is a licensed professional who has extensive experience and knowledge in plumbing, typically overseeing apprentices and journeymen. The term "plumbing assistant" can refer to anyone helping in plumbing tasks but does not suggest a formal training relationship as with an apprentice.