I have 3 rentals that are finishing the final rehab before being rented. They are in northern IN where it can get down to 0 F in the coldest winter nights (and possibly even lower). 

They all have exterior spigots/hydrants that are operational and I'm concerned about them freezing in the winter. 

What are others doing to prevent them from freezing? Do the "anti-freeze" hydrants work? Like this: https://www.menards.com/main/p...

Or should I install shutoff valves in the basements and pay my Property MGMT to shut these off each year?

Thanks so much in advance!