(1) The board will accept the following documentation of experience for master plumber applicants:

(a) Written affirmation from a licensed master plumber(s) or a licensed plumbing contractor(s) by whom the applicant was employed certifying by detailed description of the applicant's plumbing experience, that the applicant meets the qualifications set by 37-69-305, MCA.

(b) Practice in the fields of steam fitting, hydronics, and industrial piping will not be considered as acceptable experience in the field of plumbing for the master license experience requirement.