Specifications

53
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Stainless Steel Reduced Pressure Principle 975XLST
• 3/8”, 1/2”
• Stainless steel reduced pressure principle backflow prevention assembly
• Ideal for systems that use liquids that are corrosive to copper alloys
• Check components are made from lead-free engineered plastics (Noryl
®
)
and stainless steel
• Full port ball valves (standard)
• Maximum working water pressure 175 psi
• Maximum working water temperature 180°F
• ASSE
®
Listed 1013
• Approved by the Foundation for Cross-Connection Control and
Hydraulic Research at the University of Southern California
• California AB 1953 compliant
Model 975XLST FNPT x FNPT end connections
Model 975XLSTL Less shut-off valves
For Additional Information, reference WK-BPC catalog or visit
our web site.
OptionsTypical InstallationX Ref Features
Designed for installation on potable water lines to protect against both backsiphonage and
backpressure of contaminated water into the potable water supply. The Model 975XLST
provides protection where a potential health hazard exists. The valve’s stainless steel con-
struction is ideal in those systems that utilize liquids corrosive to copper alloys. Potential ap-
plications include: medical diagnostic equipment, food processing, distilleries and brewer-
ies. Additionally, the 975XLST is ideal for applications requiring valves that are lead free.
 Air gap (Model AG)
 Quick test set (QT-SET)
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 minimum 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.
 Test cock lock (Model TCL24)
 Thermal expansion tank (Model XT)
Accessories Applications
12" MIN.
30" MAX.
DIRECTION OF FLOW.
AIR GAP
MODEL AG
MODEL 975XLST
DRAIN
WILKINS WATTS CONBRACO
975XLST SS009 40-200-T2S
Backflow Preventers