After plumbing work, there are usually several valves: main, kitchen, bathroom, geyser, washing machine, etc. For the plumber, it’s obvious which is which. For you, a few weeks later, it’s just a row of mysterious knobs.
If you request simple labels—written with marker or small tags like “kitchen,” “bathroom 1,” “geyser”—you don’t have to play guessing games in emergencies or repairs. You can calmly shut off only the area where there’s a problem.
It’s a two-minute extra step for the plumber and years of clarity for you.
