1.  Apprentice plumber. 

1-A.  Commissioner.  "Commissioner" means the Commissioner of Professional and Financial Regulation.  

1-B.  Department.  "Department" means the Department of Professional and Financial Regulation.  

2.  Board.  "Board" means the Plumbers' Examining Board appointed under section 3401.  

2-A.  Journeyman-in-training.  "Journeyman-in-training" means a person who is licensed under this chapter to assist in making plumbing installations under the direct supervision of a journeyman plumber or a master plumber who may not act as or represent that the person is a journeyman plumber, as defined in subsection 3.  

3.  Journeyman plumber.  "Journeyman plumber" means any person who customarily performs the work of installing plumbing and drainage under the employment and direction of a master plumber or, not being a master plumber, does plumbing repair work as a regular part-time occupation.  

4.  Limited license.  "Limited license" means a limited plumber's license to install and service plumbing work related to a specific type of plumbing equipment or to specific plumbing installations granted to any person who has passed a satisfactory examination before the board. It must specify the name of the person who is limited to engage in the occupation of installing and servicing the plumbing work related to the type of equipment or to specific plumbing installations only as authorized by the license.  

5.  Master plumber.  "Master plumber" means any individual qualified under this chapter engaging in or about to engage in the business of installing plumbing or plumbing systems. The license must specify the name of the individual to whom the license is issued.  

5-A.  Propane and natural gas installer.  A "propane and natural gas installer" means a person licensed under chapter 139 when installing propane and natural gas utilization equipment, subject to the restrictions of that person's license.  

6.  Trainee plumber.  "Trainee plumber" means any person who is engaged in assisting in making plumbing installations under the direct supervision of one or more licensed journeyman plumbers or licensed master plumbers, whether for the purpose of learning the trade or otherwise.  

7.  Trainee plumber.