Wilkins 6-350 Horizontal Vertical Backflow Preventer 6 Inch Flanged Ductile Iron Dual Check 125 Lb

Product Description

The Wilkins 6-350 is a heavy-duty backflow preventer designed for large-scale commercial and industrial water systems. This unit installs in either horizontal or vertical orientation, giving plumbers and contractors flexibility on job sites where space or pipe routing varies. The 6-350 belongs to the Wilkins 350 Series, a line built specifically for high-demand water supply applications where protecting potable water from contamination is a code requirement and a safety priority.

The body is constructed from ductile iron, which offers superior strength and impact resistance compared to standard cast iron. An epoxy coating protects internal and external surfaces from corrosion, extending service life in demanding environments. The unit features flanged non-rising stem shut-off valves on both ends, making it compatible with standard flanged pipe connections commonly found in large commercial plumbing systems. The full port design minimizes flow restriction, maintaining system pressure and performance across the valve.

This backflow preventer uses a dual check mechanism to block reverse flow and prevent backpressure or backsiphonage from contaminating the upstream water supply. It is rated for water service at pressures up to 175 psi and temperatures up to 140 degrees Fahrenheit. The pressure class is 125 lb, consistent with standard commercial flanged piping systems. The overall length is 44 and 3 quarter inches, so installers should confirm adequate clearance before rough-in. The unit is domestically manufactured, meeting procurement requirements on projects that specify domestic origin. HVAC mechanics, commercial plumbers, and fire suppression contractors rely on large-diameter backflow preventers like the Wilkins 6-350 to meet local plumbing codes and cross-connection control regulations.

• Dual check backflow prevention protects potable water from backpressure and backsiphonage contamination
• Ductile iron body with epoxy coating resists corrosion and delivers long-term durability in commercial applications
• Horizontal and vertical installation compatibility provides flexibility for varied pipe configurations and tight mechanical rooms

Product Highlights

The Wilkins 6-350 delivers reliable large-diameter backflow protection with a full-port ductile iron body, dual check design, and flanged connections rated to 175 psi. It is a code-compliant solution for commercial and industrial water systems requiring dependable cross-connection control.

Product Information

Standard Information

• Brand: WILKINS
• Manufacturer Part Number: 6-350

Technical Specifications

• Series: 350
• Nominal Size: 6 inches
• Type: Horizontal/Vertical
• Backflow Type: Dual Check
• Body Material: Ductile Iron
• Finish: Epoxy Coated
• End Style: Flanged Non Rising Stem Shut-off Valves
• Port Type: Full
• Pressure Rating: 175 psi
• Pressure Class: 125 lb
• Temperature Rating: 140 degrees F
• Media: Water
• Dimensions: 44 and 3 quarter inches L
• Domestic/Import: Domestic