I needed to identify the Emergency water shut-off valves in a building for safety and insurance purposes. A quick check on-line didn't result in any single particular standard, so I quickly made these up in the Bambu slicer, and added some outdoor water shut-off tags (for those of us in cold areas). These are pretty substantial (could be reduced in thickness if too much for your needs), and the colors call attention to themselves - which is what you want in an emergency situation. Printed a second set up for home - in case I'm away, and reviewed their operation with the family - should we ever get a leak somewhere in the house.

No real design effort, but hopefully some will find it handy and useful - before a water leak emergency occurs and noone knows where the main shut-off valve(s) are.