amapanda ᚛ᚐᚋᚐᚅᚇᚐ᚜ 🏳️‍⚧️
Unable to answer "What diameter is specified on the sign for this fire hydrant?" for https://osm.org/node/3203168581 via StreetComplete 42.0:

Fire hydrant width unclear

Attached photo(s):
https://westnordost.de/p/86862.jpg