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Item # Model 950XLT, Model 950XLT - Top Access Double Check Valve Assembly

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Designed for installation on potable water lines to protect against both back siphonage and backpressure of polluted water into the potable water supply. A tethered test cock cap is provided to protect against fouling caused by insects, dirt and debris. Assembly shall provide protection where a potential non-health hazard exists.

Standards Compliance
(Unless otherwise noted, applies to 3/4" thru 2" Horizontal)
  • ASSE® Listed 1015 (Vertical flow-up:1 1/4" thru 2")
  • IAPMO® Listed
  • AWWA Compliant C510
  • CSA® Certified (Vertical flow-up:1 1/2" & 2")
  • NYC MEA 426-89-M VOL 3
  • Approved by the Foundation for Cross Connection Control and Hydraulic Research at the University of Southern California
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 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. If installed below grade, be certain adequate drainage is provided to prevent the device from being submerged.

The Double Check Type Backflow Preventer shall be ASSE Listed 1015, rated to 180ºF and supplied with full port ball valves. The main body and access covers shall be 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 first and second check shall be located at a 45º angle and accessible for maintenance from the top of the device, without removing the device from the line. Each check shall have separate access covers and test cocks shall be accessible from the top of the device. Test cocks shall be protected from debris by a tethered cap. The Double Check Type Backflow Preventer shall be a WILKINS Model 950XLT.


Sizes Available

3/4 in
1 1/4
1 1/2

Maximum Working Water Pressure

175 psi

Maximum Working Water Temperature

180 ºF

Hydrostatic Test Pressure

350 psi

End Connections Threaded

ANSI B1.20.1

Main Valve Body

Cast Bronze ASTM B 584

Access Covers

Cast Bronze ASTM B 584


Stainless Steel, 300 Series


Silicone (FDA approved)
Buna Nitrile (FDA approved)


NSF Listed


Stainless steel, 300 series

Test Cock Cover



FT - With "Fast Test" test cocks
Less Ball Valves (L)

S - With Bronze "Y" Type Strainer

U - With Union Ball Valves


Bronze wye strainer
QT-SET Quick Test Fitting Set

Repair kit (rubber only)

Stainless steel ball valve handles

Test Cock Lock (Model TCL24)

Thermal expansion tank (Model WXTP)


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