Optional · 1 of 3
Tickets that open doors
Master plumber license
Needed to pull permits and run your own shop in most states. Extra exam after several years as a journeyman.
Welding certification
Pipe welding opens up industrial and process work.
Medical gas installation
Oxygen and vacuum lines in hospitals. Separate certification, and tightly inspected.
Backflow prevention tester
Short course and a state certification. Steady annual testing work that is yours to keep.
Gasfitting and HVAC (heating, ventilation and air conditioning) tickets
Widen what you can legally touch on the same job.