Freeze proof barn tap

I heard of this drain back tap?, what is it called? how would I install it? Where can I buy one? I have asked my plumber, but he has never heard of it. Has anyone see any info on the net ?
"Make sure that the waterlines coming into the barn won't freeze up. Sometimes, all it takes is insulating the above-ground pipe leading to the faucet or tap. If not, you might have to install a hydrant-type system, which send the water back below the frost line when not in use. "
CathyLee
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Do a google search for yard hydrants. I think one company that makes them is woodford.
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http://www.plumbingwarehouse.com/woodfordyardhydrants.html I'm guessing this is what your looking for?
the source of water is below the frost line so you have to dig a pit where you want the water hydrant to be located. the valve shuts the water off below the frost line then a small hole just above the valve let the water in the hydrant drain back down. this work well provided you don't leave a hose with a nozzle on it in the closed position (there by not allowing the water to drain back down the hydrant when you turn it off)

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