
According to my recollection, there was construction work in the Torenstraat last year. Possibly the hydrant is no longer present. I will be in the area in 3 weeks and can take a look.
If it is on the footpath, then it is probably a hydrant of this type:
See fire_hydrant:type=underground at https://wiki.openstreetmap.org/wiki/Tag:emergency%3Dfire_hydrant#fire_hydrant:type=*_details