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Erma1ina Erma1ina is offline
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Default Installing new vacuum breaker on a hose bib

David Nebenzahl wrote:

On 10/3/2008 3:58 AM spake thus:

On Thu, 02 Oct 2008 21:25:32 -0700, David Nebenzahl

It was something of a bitch. I noticed the setscrew on the new one
I bought, but couldn't see or feel any such screw on the old one,
just a round bump. So I just torqued the **** out of it with a pipe
wrench (crescent wrench holding the valve body). I threaded the new
breaker on, then tightened the setscrew. After just a few turns, it
promptly broke off, apparently just as it was designed to do (I
could see it had a narrow shank).

I'd remove those set screws and use standard ones.

I probably will next time. But they're obviously made to snap off on
installation: why is that? (That bump I felt on the old one was the
shank of the broken setscrew.) Makes it really hard to remove them.

By the way, after testing it I could see why these are good things to
install: after turning on the hose bib and letting the hose reel fill
up, I closed the bib, whereupon a large gush of water sprayed out of the
anti-siphon valve. Had it not been there, all that water would have gone
back inside the house plumbing, along with whatever crap was in the hose
(or in a pool the hose was thrown into, in some cases).

Washing one's hands of the conflict between the powerful and the
powerless means to side with the powerful, not to be neutral.

- Paulo Freire

David, if you live in an area where freezing occurs, you should install
that anti-siphon valve so that it can be removed from the hose bib
because it prevents the bib from being emptied of water even after the
hose is removed.

I use the kind of anti-siphon valve you're talking about and removed
that set-screw before installing it because tightening the set screw
prevents the valve from being unscrewed from the hose bib. I live in the
Midwest where freezing is a certainty.