Zurn Wilkins 1-350 1" DCVA Double Check Backflow Preventer.

Product Overview

The Zurn Wilkins 1-350 Double Check Valve Assembly (DCVA) provides reliable backflow prevention for low-hazard, non-potable water applications. Designed to guard against both backsiphonage and backpressure, this assembly ensures that polluted water does not re-enter your supply line.

Constructed with a bronze body and reinforced nylon housing, the 1-350 combines strength and corrosion resistance with ease of service. Its EZSwap™ removable pressure vessel allows for fast flushing, winterization, and simple maintenance, reducing downtime and labor costs.

Note: This model is not recommended for potable water applications. For potable systems, consider the Zurn Wilkins 350XL Lead-Free DCVA series.

Features & Benefits

• Trusted Backflow Protection – Prevents both backsiphonage and backpressure in low-hazard, non-potable water systems.

• EZSwap™ Removable Pressure Vessel – Easily removed with a flush tool for quick flushing, winterization, or off-line service.

• Durable Construction – Bronze valve body and reinforced nylon housing resist corrosion, mineral build-up, and outdoor exposure.

• Stainless Steel Hardware – Shut-off handles, fasteners, and struts provide long-lasting reliability.

• Quick Service Access – First and second check assemblies can be maintained without removing the valve from the line.

• Cost-Efficient Maintenance – Repair costs and downtime are reduced, saving up to 75% over the product’s lifecycle.

Specifications

• Model: Zurn Wilkins 350

• Size: 1"

• Body Material: Bronze (ASTM B 584)

• Housing: Reinforced Nylon

• Elastomers: FDA-approved Silicone and Buna Nitrile

• Internals: Delrin, NSF Listed

• Springs & Hardware: Stainless Steel, 300 Series

• Ball Valves: Cast Bronze

• Max Working Pressure: 175 PSI

• Max Working Temperature: 180°F

• Hydrostatic Test Pressure: 350 PSI

• End Connections: Threaded ANSI B1.20.1

• Weight: Approx. 6 lbs (with ball valves)

• Certifications: ASSE® 1015, CSA® B64.5, IAPMO®, AWWA C510, USC Foundation Approved, UL®/C-UL® Classified (less shut-off valves)

Installation Tips

• Install according to local plumbing codes and manufacturer instructions.

• Mount at 12"–30" above grade with adequate drainage.

• Allow sufficient clearance for testing and servicing.

• If installed below grade, ensure proper drainage to avoid submersion.

• Use blow-out/flush fittings for quick winterization and freeze protection.

FAQs

Q: Can the 1-350 be used in drinking water systems?
No, this model is not intended for potable water. Use the Zurn Wilkins 350XL Lead-Free series for potable applications.

Q: Where is the 1" 350 typically used?
It is commonly installed in irrigation, HVAC loops, fire protection bypasses, and other low-hazard non-potable systems.

Q: How often should it be tested?
Annual testing is required in most jurisdictions, or more frequently depending on local code.

Q: Is servicing complicated?
Not at all. The EZSwap™ pressure vessel allows off-line service, making repairs quick and safe.