Specification Sheet

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Flow Characteristics
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
12" MIN.
30" MAX.
DIRECTION OF FLOW
AIR GAP
DRAIN
0
3
6
9
12
15
5
10
15
20
FLOW RATES (GPM)
PRESSURE LOSS (PSIG)
69
PRESSURE LOSS (kpa)
FLOW RATES (l/s)
MODEL 975XL 1/4", 3/8" & 1/2" (STANDARD & METRIC)
35
1/2" (15mm)
103
0.95
0.76
0.57
0.38
0.19
137
3/8" (9mm)
1/4" (6mm)
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 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 or where relief valve discharge
could cause damage.
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 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 checks shall be oriented at a 45° angle up-
ward and 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 and “Y” type strainer. The Reduced Pressure Principle Backflow Preventer
shall be a ZURN WILKINS Model 975XL.
INDOOR INSTALLATION
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