Submittal Sheet

Page 2 of 2
WILKINS a Zurn company, 1747 Commerce Way, Paso Robles, CA 93446 Phone:[phone] Fax:[phone]
IN CANADA: ZURN INDUSTRIES LIMITED, 3544 Nashua Dr., Mississauga, Ontario L4V 1L2 Phone:[phone] Fax:[phone]
Product Support Help Line: 877-BACKFLOW (877-222-5356) • Website: http://www.zurn.com
0
20
40
60
80
5
10
15
20
0
50
100
150
200
250
5
10
15
20
Rated Flow (Established by approval agencies)
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
9.56.3
3.2
5.0
3.82.52
1.26
1 1/2”
(40mm)
137
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 specied, the assembly shall be mounted at a
minimum of 12” (305mm) and a maximum of 30” (762mm)
above adequate drains with sufcient side clearance for
testing and maintenance. The installation shall be made
so that no part of the unit can be submerged.
OUTDOOR INSTALLATIONINDOOR INSTALLATION
(Shown w/optional BMS)
SPECIFICATIONS
The Reduced Pressure Principle Backow Preventer shall be ANSI 3
rd
party certied to comply with states' lead
plumbing law 0.25% maximum weighted average lead content requirement, 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 rst 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 Backow Preventer shall be a WILKINS Model 975XL2.
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
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
FLOW CHARACTERISTICS