Zurn Wilkins 350XL DCVA Double Check Valve Assembly Backflow Preventer Lead-Free (1/2" - 2")

Zurn Wilkins 350XL DCVA Double Check Valve Assembly Backflow Preventer – Lead-Free (1/2"–2")

Product Overview

The Zurn Wilkins 350XL Double Check Valve Assembly (DCVA) delivers reliable backflow prevention for potable water systems in residential, commercial, and light industrial applications. Designed to protect against both backsiphonage and backpressure, the 350XL prevents polluted water from entering clean water supplies.

With its lead-free cast bronze body, reinforced nylon housing, and corrosion-resistant stainless steel internals, this assembly ensures long service life and compliance with modern drinking water standards. The patented removable pressure vessel simplifies maintenance, while top-mounted test cocks make inspection and testing easier. Compact and durable, the 350XL is trusted for domestic water, fire protection, irrigation, and waterworks installations.

Features & Benefits

• Lead-free construction for potable water applications

• Patented removable pressure vessel simplifies service and repair

• Top-mounted test cocks for quick and accurate testing

• Optional blow-out flush fitting for debris removal

• Complies with ASSE®, AWWA, CSA, UL, and IAPMO standards

• Rugged cast bronze and stainless steel design for durability

Applications

The 350XL DCVA is ideal for protecting potable water lines in:

• Domestic water systems

• Irrigation lines

• Fire protection systems

• Waterworks and commercial plumbing

Specifications

• Model: 350XL Series

• Sizes: 1/2", 3/4", 1", 1-1/4", 1-1/2", 2"

• Body Material: Cast Bronze (ASTM B 584)

• Housing: Reinforced Nylon

• Fasteners & Springs: Stainless Steel, 300 Series

• Elastomers: FDA-approved Silicone & Buna Nitrile

• Internals: Delrin, NSF Listed

• Ball Valves: Cast Bronze, ASTM B 584

• Maximum Working Pressure: 175 PSI

• Maximum Temperature: 180°F (82°C)

• Hydrostatic Test Pressure: 350 PSI

• Connections: FNPT Threaded ANSI B1.20.1

• Compliance:

  • ASSE® Listed 1015

  • IAPMO® Listed

  • CSA® Certified B64.5

  • AWWA Compliant C510

  • USC FCCC&HR Approved

  • UL® and C-UL® Classified (less shut-off valves)

Installation Tips

• Install horizontally or vertically as permitted by code.

• Leave clearance for testing, inspection, and maintenance access.

• Ensure proper drainage in case of discharge.

• Protect from freezing or extreme environmental conditions.

• Always follow local code requirements for installation and testing.

FAQs

Q: What is a DCVA?
A Double Check Valve Assembly protects potable water supplies from backpressure and backsiphonage of non-health hazard pollutants.

Q: Is the 350XL suitable for drinking water?
Yes, it is lead-free and fully compliant with potable water safety standards.

Q: What makes servicing easier?
The patented removable pressure vessel allows fast, efficient maintenance without removing the assembly from the line.

Q: What applications does this valve serve best?
It’s commonly used in irrigation, fire protection, domestic water service, and general waterworks.