ZURN WILKINS
1747 Commerce Way, Paso Robles, CA 93446 Phone:855-663-9876 Fax:805-238-5766
Model 375XL, 375XLB, 375ST LEAD-FREE*
Reduced Pressure Principle Assembly (1/2", 3/4" & 1")
*This product contains a weighted average lead content less than 0.25% for wetted surfaces.
*Certied to NSF/ANSI 61-G
CAUTION: Installation of Backow Pre-
venters must be performed by qualied,
licensed personnel. The installer should
be sure the proper device has been
selected for the particular installation.
Faulty installation could result in an
improperly functioning device.
ZURN WILKINS Model 375 Reduced Pres-
sure Principle Backow Preventers are for
use on potable water lines where a health
hazard could exist if a backow situation
were to occur.
Proper performance is dependent upon
following these installation instructions and
prevailing governmental and industry stan-
dards and codes. Failure to do so, according
to ZURN WILKINS Limited Warranty "...
releases ZURN WILKINS of any liability that
it might otherwise have with respect to that
device." Such failure could also result in an
improperly functioning device.
Damage to the device could result wherever
water hammer and/or water thermal expan-
sion could create excessive line pressure.
Where this could occur, shock arresters and/
or pressure relief valves should be installed
downstream of the device.
1. Before installing a Model 375
Backow Preventer, ush the line thor-
oughly to remove all debris, chips and
other foreign matter. If required, a strainer
should be placed upstream of the Backow
Preventer.
CAUTION: Do not use a strainer in sel-
dom used emergency waterlines such
as re lines.
2. Provide adequate space around the
installed unit so that the test cocks will be
accessible for testing and servicing.
3. WARNING: If installation of a Model
375 is in a building, a suitable drain ar-
rangement MUST be provided to drain
off spillage from the relief valve. An air
gap at least two times the pipe diameter
must be provided between the relief valve
and the drain piping to prevent a cross-
connection. Air Gap AG-11 not intended
to support weight of drain pipe.
CAUTION: Do not pipe the relief valve
solidly to a oor drain, sewer or sump.
CAUTION: An adequately sized drain is
required to prevent possible water dam-
age due to relief valve discharge.
375 REDUCED PRESSURE PRINCIPLE
1. Start with both shut-off valves closed.
Slowly open the inlet shut-off valve until the
backow preventer is completely pressur-
ized. A brief discharge from the relief valve
may occur while the device is pressurizing.
The discharge should cease by the time
the shut-off valve is fully open. Device
should function properly. If the discharge
does not stop, refer to "MAINTENANCE
INSTRUCTIONS" for repair procedures.
2. After the device has been pressurized,
vent all trapped air from both check valves
by slightly opening each of the four test
cocks.
3. Slowly open the downstream shut-off
valve. The Model 375 Reduced Pressure
Principle Backow Preventer is now in
service.
4. If "spitting" or intermittent discharges
from the relief valve are noted, it could
be a result of pressure uctuation and/or
a water hammer condition in the system.
If such conditions exist, install a ZURN
WILKINS water pressure reducing valve, a
ZURN WILKINS Model 40XL check valve,
or a ZURN WILKINS Model 1250XL water
hammer shock arresters in compliance with
industry standards as needed.
5. After the Model 375 has been prop-
erly installed, test the device (see "TEST
PROCEDURES"). If the device fails the
test, remove the rst and second check
valves and thoroughly ush the device. If
the relief valve fails to operate properly,
inspect the sensing passage for clogging
(see "MAINTENANCE INSTRUCTIONS").
Clean rubber seals of all debris and place
unit back in service.
4. Install valve at least 12 inches above
surrounding ood level.
5. Always consult local codes for installa-
tion methods, approvals and guidance.
OUTDOOR INSTALLATION
Model 375 Backow Preventers may be
installed outdoors only if the device is
protected against freezing conditions.
Exposure to freezing conditions will result
in improper function or damage to the
device. The installation location must be
kept above 32°F. All the basic installation
instructions apply.
If installation is in a pit or vault, the Backow
Preventer must never be submerged in water
because this will cause a cross-connection.
Make sure that the pit or vault always remains
dry by providing ample drainage.
INDOOR INSTALLATION
Indoor installation is preferred in areas
that are subject to freezing conditions. All
the basic installation instructions apply to
such installations.
PARALLEL INSTALLATION
Where uninterrupted service from a single
meter connection must be maintained, two
or more Backow Preventers may be con-
nected in parallel. All the basic installation
instructions apply to parallel installation.
Be sure to allow adequate room between
the units for testing and repair.
PLACING THE DEVICE IN SERVICE
After the installation of a Model 375 has
been completed, place the unit in service
as follows:
1
Installation Testing Maintenance Instructions
FLOOR
DRAIN
INLET SHUT OFF
DIRECTION OF FLOW
12" MIN.
30” MAX.
AIR GAP
OPTIONAL
WATER
METER
175 PSIG 180ß F
3/4" 375 RP
ZURN
WILKINS
2” PIPE
(DRAIN LINE CAN
BE ANY STANDARD
PIPING MATERIAL)
PROTECTIVE
ENCLOSURE
WILKINS
XL
®
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