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
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Rated Flow (established by approval agencies)
Flow Characteristics
Specications
The Reduced Pressure Detector Backflow Prevention Assembly shall be certified to NSF/ANSI 61, ASSE® Listed 1047, and
supplied with full port OS & Y gate valves. The main body and access cover shall be 304L Stainless Steel, 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 Detector Backflow Prevention Assembly shall be a ZURN WILKINS Model 375ASTDA.
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 other-
wise 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 mainte-
nance. The installation shall be made so that no part of the unit
can be submerged.
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
0
69
138
207
0.0
63.1
126.2 189.3 252.4
0
10
20
30
0 1000 2000 3000 4000
PRESSURE LOSS (kpa)
FLOW RATES (l/s)
PRESSURE LOSS (PSID)
FLOW RATE (GPM)
MODEL 375ASTDA 6", 8" & 10" (STANDARD AND METRIC)
0
35
69
104
138
0.0 12.6 25.2 37.9 50.5
0
5
10
15
20
0 200 400 600 800
PRESSURE LOSS (kpa)
FLOW RATES (l/s)
PRESSURE LOSS (PSID)
FLOW RATES (GPM)
MODEL 375ASTDA 2 1/2", 3" & 4" (STANDARD & METRIC)
4" (100mm)
6" (150mm)
3" (80mm)
2 1/2" (65mm)
8" (200mm)
10" (250mm)
12” MIN.
30” MAX.
PROTECTIVE
ENCLOSURE
DIRECTION OF FLOW
ZURN WILKINS MODEL 375ASTDA
OUTDOOR HORIZONTAL INSTALLATION
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