On Fri, Jun 9, 2017 at 11:10 PM, Viking <vikin...@tin.it> wrote: > Is this the diameter of the underground pipe or the diameter of the > threaded outlet? > > it's of the underground pipe. This is easier known that the threaded outlet in case of underground fire hydrants in Belgium, as this is usually indicated on a nearby sign. If you look at the photo in [1], the 80 is die diameter the pipe, the two other numbers are the distance to the left and forward from the sign. I believe the same information is available in some other countries as well.
regards m.
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