Specification


Rated Flow (established by approval agencies)
Flow Characteristics
Page 2 of 2
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
7900 Goreway Drive, Unit 10, Brampton, Ontario L6T 5W6, 877-892-5216
www.zurn.com
Typical Installation
Local codes shall govern installation requirements. To be installed
in accordance with the manufacturer’s instructions and the latest
edition of the Uniform Plumbing Code. Unless otherwise specified,
the assembly shall be mounted at a minimum 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.
INDOOR INSTALLATION
(Shown with optional MS)
INDOOR INSTALLATION
(Shown with optional BMS)
Specications
The Reduced Pressure Principle Backflow Preventer shall be ASSE® Listed 1013, rated to 180°F and supplied with full port ball
valves. The main body and access covers shall be 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 disassembling the relief valve or the entire device from the line. If installed indoors, the installation shall be supplied with
an air gap adapter, integral monitor switch and appropriate drain. The Reduced Pressure Principle Backflow Preventer shall be
a ZURN WILKINS Model 975XLTCU.
BATTERY
MONITOR
SWITCH
(OPTIONAL)
AIR GAP
FITTING
12" MIN.
30" MAX.
FLOOR DRAIN
DIRECTION OF FLOW
FLOOR
CENTRAL
STATION
ALARM
PANEL
975XL
WILKINS
ZURN
ASSE 1013
DRAIN
W/ AIR GAP
DIRECTION OF FLOW
12" MIN.
30" MAX.
CONTACT PANEL WITH
LOW VOLTAGE ELECTRICAL
ALARM, HORN OR LIGHT
975XL
WILKINS
ZURN
ASSE 1013
Capacity thru Schedule 40 Pipe
Pipe size 5 ft/sec 7.5 ft/sec 10 ft/sec 15 ft/sec
1/8" 1 1 2 3
1/4" 2 2 3 5
3/8" 3 4 6 9
1/2" 5 7 9 14
3/4" 8 12 17 25
1" 13 20 27 40
1 1/4" 23 35 47 70
1 1/2" 32 48 63 95
2" 52 78 105 167
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 975XLTCU 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
9.56.3
3.25.0
3.82.52
1.26
1 1/2"
(40mm)
137