[Tagging] fire hydrants

[Viking]

Ok, so there is an error in Italian hydrants wiki page. I will fix it.
At this point I would propose a new tag for the number and the diameter of the threaded outlet.
For an hydrant with two 45 mm outlets and one 100 mm outlet:

fire_hydrant:outlets=45;45;100

Or do you have better proposals?

Alberto


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