What belongs in your text
Show what carries over from another field. Do not claim experience you do not have. For plumbing technician, this matters when you inspect pipes and install fittings. Write what you did, where it happened and why the work was useful.
A good example is a short account of how you find faults and plan repairs. It shows real work rather than an empty claim. If you have not done that task, choose a different example from your own work.