Hi doc,
No, I did not install them, but two times I've dug them out to re-attached the plastic supply line when it's detached. There's no gravel at the bottom of the hole. [img]/forums/images/icons/frown.gif[/img]
I bought a heat tape and some pipe insulation I'm going to try on the hydrant the horses can't get to, i.e., chew on.