Product Overview

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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
MODEL 375 2 1/2", 3" & 4" (STANDARD & METRIC)
0
5
10
15
20
0 200 400 600 800
FLOW RATES (GPM)
PRESSURE LOSS
(PSIG)
0
35
69
104
138
0.0 12.6 25.2 37.9 50.5
FLOW RATES (l/s)
PRESSURE LOSS
(kpa)
MODEL 375 6", 8" & 10" (STANDARD & METRIC)
0
5
10
15
20
0 1000 2000 3000 4000
FLOW RATES (GPM)
PRESSURE LOSS
(PSIG)
0
35
69
104
138
0.0 63.1 126.2 189.3 252.4
FLOW RATES (l/s)
PRESSURE LOSS
(kpa)
FLOW CHARACTERISTICS
TYPICAL INSTALLATION
Local codes shall govern installation requirements. 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.
SPECIFICATIONS
The Reduced Pressure Principle Backow Prevention Assembly shall be 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 Grade 4), 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 Backow Prevention Assembly shall be a WILKINS Model 375.
OUTDOOR INSTALLATION
INDOOR INSTALLATION (375GF)
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.
10" (250mm)
8" (200mm)
6" (150mm)
2 1/2" (65mm)
3" (80mm)
4" (100mm)
 Rated Flow (Established by approval agencies)