"Unfortunately, all the walls of the house are 36" thick stone and it
does get cold enough in the stone to freeze the pipe all the way to the
inside because I had it happen one year when I forgot to drain one of
the pipes. There is no way to slope the pipe down to the outside so
that I can simply open the outside faucet after I shut of the water
Uh oh. If you can't slope it down towards the outside or at least make
it level, then the freeze proof sillcock won't work either, as that has
to be able to drain too. Something is very wrong if this is setup so
the pipe is pitched in the wrong direction
Just out of curiousity, how do you know the pipe actually froze all the
way back to the inside wall? Was it split that far in?
If you can get a 24" one, then one solution would be to enlarge the
pipe opening to about 2" in diameter for the last 14" of the inside
wall. If you seal off the pipe hole outside with expanding foam, that
should allow enough warm air to get around the pipe so it won't freeze.
It would be a pain to do, but it would be a solution.
The longest frostfree valve made (even for commercial use) is
24". This means the shut off would still be 12" into the stone. At this
point the only solution that the plumbers suggest is to put a shutoff
valve and a drain valve inside. Unfortunately there is no good place to
place this without it sitting in plain view in a finished space. I
hoped that osmeone knew of a source of very long frost free valves that
my plumbers and I had not discovered. Thanks