Installation Guide

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
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Rated Flow (established by approval agencies)
Flow Characteristics
Typical Installation
Local codes shall govern installation requirements. 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.
Specications
The Reduced Pressure Principle Backflow Prevention Assembly shall be certified to NSF/ANSI 61, ASSE® Listed 1013, and
supplied with full port gate valves. The main body and access cover shall be epoxy coated ductile iron (ASTM A 536), the seat
ring and check valve shall be NORYL™, the stem shall be stainless steel (ASTM A 276) and the seat disc elastomers shall
be EPDM. The checks and the relief valve shall be accessible for maintenance without removing the device from the line. The
Reduced Pressure Principle Backflow Prevention Assembly shall be a ZURN WILKINS Model 375A.
OUTDOOR INSTALLATION (375A with FSC option)INDOOR INSTALLATION (375A with BG option)
Capacity thru Schedule 40 Pipe (GPM)
Pipe size 5 ft/sec 7.5 ft/sec 10 ft/sec 15 ft/sec
2 1/2" 75 112 149 224
3" 115 173 230 346
4" 198 298 397 595
6" 450 675 900 1351
8" 780 1169 1559 2339
10" 1229 1843 2458 3687
12" 1763 2644 3525 5288
PROTECTIVE
ENCLOSURE
DIRECTION OF FLOW
12" MIN.
30" MAX.
AIR GAP
W/DRAIN
DIRECTION OF FLOW
12" MIN.
30" MAX.
0
34
69
103
0.0 6.3 12.6 18.9 25.2 31.5
0
5
10
15
0 100 200 300 400 500
PRESSURE LOSS (kPa)
FLOW RATE (l/s)
PRESSURE LOSS (PSIG)
FLOW RATE (GPM)
MODEL 375A 2-1/2", 3" (STANDARD & METRIC)
0
34
69
103
0.0 25.2 50.5 75.7 100.9
0
5
10
15
0 400 800 1200 1600
PRESSURE LOSS (kPa)
FLOW RATE (l/s)
PRESSURE LOSS (PSIG)
FLOW RATE (GPM)
MODEL 375A 4" & 6" (STANDARD & METRIC)
0
34
69
103
138
0 63.1 126.2 189.3 252.4
0
5
10
15
20
0 1000 2000 3000 4000
PRESSURE LOSS (kPa)
FLOW RATE (l/s)
PRESSURE LOSS (PSIG)
FLOW RATES (GPM)
MODEL 375A 8" & 10" (STANDARD AND METRIC)
8" (200mm)
10" (250mm)
6" (150mm)
3" (80mm)
2 1/2" (65mm)
4" (100mm)