Typical Installation:
Single Vacuum Breaker
1. Vacuum breaker must be installed
with the supply connected to the bot-
tom and the outlet connected to the
appliance, as shown below:
2. The bottom of the no.
8
should be
at least 6” above the
fl
ood rim of the
fi
xture or appliance.
3. When using a portable appliance,
no.
8
should be installed at least 6”
above the highest point to which the
outlet can be raised, as shown:
Note: Where the device is a
separate unit, in the absence of a
Critical Installation Level (CIL)
mark, the extreme bottom of the
no.
8
casting should be used to
determine its installed position.
Where the device is incorporated
in an outlet tube furnished by the
manufacturer, the extreme bot-
tom of the internal unit should
be noted on the outside of the
tube by a CIL line, for use in
determining its installed position.
4. The water supply valve must be
installed on the supply side (ahead)
of the vacuum breaker, and no shut-
off valve should be installed on the
outlet side (downstream).
5. The vacuum breaker should not be
subjected to continuous pressure for
more than twelve (12) hours.
Note: This device should not be
installed in a concealed or inac-
cessible location, nor where the
venting water from the device
during its normal functioning
may be deemed objectionable.
not less than 6”
(CIL)
supply
valve
fi
xture or
appliance
over
fl
ow
or
fl
ood
rim
highest position of appliance not
less than 6” (CIL)
supply
valve
8
8
4
General Instructions
