Specification

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Flow Characteristics
Zurn Industries, LLC
| Wilkins
1747 Commerce Way, Paso Robles, CA U.S.A. 93446  Ph. 855-663-9876, Fax [phone]
In Canada | Zurn Industries Limited
3544 Nashua Drive, Mississauga, Ontario L4V 1L2  Ph. 905-405-8272, Fax [phone]
www.zurn.com
Page 2 of 2
Typical Installation
Local codes shall govern installation requirements. To be
installed in accordance with the manufacturers’ instructions
and the latest edition of the Uniform Plumbing Code. Unless
otherwise specified, the assembly shall be mounted at a mini-
mum of 12” (305mm) and a maximum of 30” (762mm) above
adequate drains with sufficient side clearance for testing and
maintenance. The installation shall be made so that no part of
the unit can be submerged.
OUTDOOR INSTALLATION
INDOOR INSTALLATION
(Shown w/optional BMS)
Speci cations
The Reduced Pressure Principle Backflow Preventer shall be certified to NSF/ANSI 372 shall be ASSE® Listed 1013, rated to
180°F, and supplied with full port ball valves. The main body and access covers shall be low lead bronze (ASTM B 584), the
seat ring and all internal polymers shall be NSF® Listed Noryl™ and the seat disc elastomers shall be silicone. The first and
second checks shall be accessible for maintenance without removing the relief valve or the entire device from the line. If installed
indoors, the installation shall be supplied with an air gap adapter and integral monitor switch. The Reduced Pressure Principle
Backflow Preventer shall be a ZURN WILKINS Model 975XL2.
BATTERY
MONITOR
SWITCH*
AIR GAP
FITTING
12" MIN.
30" MAX.
FLOOR DRAIN
DIRECTION OF FLOW
FLOOR
CENTRAL
STATION
ALARM
PANEL
975XL2
WILKINS
ZURN
12" MIN
30" MAX
PROTECTIVE
ENCLOSURE
OPTIONAL
WATER METER
INLET SHUT-OFF
AIR GAP
DRAIN
DIRECTION OF FLOW
OPTIONAL LEAD-FREE STRAINER
(MODEL SXL)
975XL2
WILKINS
ZURN
WILKINS
XL
0
20
40
60
80
5
10
15
20
0
50
100
150
200
250
5
10
15
20
FLOW RATES (GPM)
PRESSURE LOSS (PSIG)
69
PRESSURE LOSS (kpa)
FLOW RATES (l/s)
MODEL 975XL2 3/4", 1", 1 1/4", 1 1/2" & 2" (STANDARD & METRIC)
35
3/4" (20mm)
1" (25mm)
1 1/4" (32mm)
2" (50mm)
103
15.8
12.6
9.5
6.3
3.2
5.0
3.82.52
1.26
1 1/2”
(40mm)
137