This product is related to this category:

Building and Industry


Wilkins 350L Series

High performance, low headloss design, short lay length, lightweight ductile iron body with corrosion resistant low lead. All plastic and stainless steel internal components. 20 – 50mm BSPT threaded Male 65 – 250mm Flanged AS4087-2011 PN16

350L XXX


  • Short lay-length for small space installation
  • Reliable performance and improved flow characteristics from patented Compound Check
  • Available in flanged, grooved, or grooved x flanged end connections for installation versatility
  • No threads or taps in body or cover, eliminating exposure to corrosion
  • Single access cover reduces maintenance down time


Designed for installation on potable water lines to protect against both backsiphonage and backpressure of polluted water into the potable water supply. The Model 350 shall provide protection where a potential health hazard does not exist. Ideal for use where lead-free* valves are required.

Standards Compliance :

(Sizes 2 1/2"-10" Horiz. & Vert.)

(Size 12" horizontal)

• ASSE® Listed 1015

• CSA® Certified B64.5

• IAPMO® Listed

• AWWA Compliant C510, and C550

• UL® Classified

• C-UL® Classified

• FM® Approved (2 1/2" - 10")

• Approved by the Foundation for Cross Connection Control and Hydraulic Research at the University of Southern California

• NYC MEA 50-01-M (2 1/2" - 3")

• NYC MEA 297-98-M (4" - 6")

• NYC MEA 316-01-M (8" - 10")

• Meets the requirements of NSF/ANSI 61*



Sizes: 2 1/2", 3", 4", 6" , 8", 10" , 12"

Maximum working water pressure: 175 PSI

Maximum working water temperature: 140°F

Hydrostatic test pressure: 350 PSI

End connections

(Grooved for steel pipe) AWWA C606

(Flanged) ANSI B16.1

Class 125

Typical Installation

Local codes shall govern installation requirements. 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.



The Double Check Backflow Prevention Assembly shall be certified to NSF/ANSI 61, ASSE® Listed 1015, and supplied with full port gate valves. The main body and access cover shall be epoxy coated ductile iron (ASTM A 536), 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 shall be accessible for maintenance without removing the device from the line. The Double Check Backflow Prevention Assembly shall be a ZURN WILKINS Model 350.


High performance, Low headloss design, short lay length, Corrosion Resistant

Lightweight Stainless Steel body

All Stainless Steel, Brass and Plastic components.

Watermark, UL, FM, USC, NSF Compliant

Wilkins 350 ASLT series
350 ASLT
PDF - Download Icon
Engineering Data*
* Note: For some products Manual or Engineering Data are available only upon request.

Cannot download file or do you need more information? Please contact us below.

Thank you! Your submission has been received!
We will contact you as soon as possible.
Oops! Something went wrong while submitting the form.

For more information or different sizing please contact us.

Product code

Wilkins 350L Series

Contact Us

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.