Can someone tell me what this is?

What does that yellow tag say?
Non Potable

It's called a dry fire hydrant. It is typically used in a non-pressurized water system where the water can be drawn directly from a pond, reservoir, large cistern, shallow well/aquifer, lake, or river.
The type of fire hydrant that we are used to seeing is a wet hydrant. These are used in pressurized water systems.
Thanks for this info, there is a very large pond nearby so that makes sense. Being as it is on my property is is going to help my insurance rates, that is good :)
 
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