Wilkins 6-350ASTOSY Double Check Backflow Preventer 6 in

Product Description

The WILKINS 6-350ASTOSY is a 6-inch double check backflow preventer designed for large-diameter commercial and industrial water systems. It features a grooved stainless steel body constructed to lead-free standards, with flanged outside stem and yoke (OSY) gate valves on both the inlet and outlet. The double check valve assembly provides reliable backflow protection by maintaining two independent spring-loaded check valves in series, preventing reverse flow from contaminating the potable water supply. Licensed plumbers and water system contractors install this assembly where code requires testable backflow prevention on high-hazard or cross-connection points.

This assembly is suited for commercial, industrial, and municipal water supply applications requiring a 6-inch testable double check valve with full-port shutoff capability. The flanged OSY gate valves allow visual open or closed confirmation at a glance, which is a requirement on many fire and domestic water systems. The grooved stainless steel body resists corrosion in wet environments and simplifies installation in mechanical rooms, vaults, and above-grade piping assemblies where space and access for annual testing must be considered.

Key Features

• 6-inch double check valve assembly with two independent check valves in series
• Lead-free stainless steel grooved body meets current potable water material standards
• Flanged OSY gate valves on inlet and outlet provide visible shutoff status
• Designed for testable backflow prevention in commercial and industrial water systems
• Grooved body construction compatible with standard grooved coupling systems

Compatibility

Designed as an OEM-style double check backflow preventer assembly for 6-inch commercial and industrial potable water supply piping systems requiring flanged OSY isolation valves.

Installation Notes

Installation must be performed by a licensed plumber or certified backflow prevention assembly tester in accordance with local plumbing codes and applicable IPC or AWWA guidelines. Shut off the water supply and depressurize the line before installing or servicing the assembly. Ensure proper support and alignment of the flanged connections to avoid stress on the body. After installation, the assembly must be tested by a certified tester and results submitted to the local water authority as required by jurisdiction.

Technical Specifications

• Size: 6 inches
• Body Material: Stainless Steel
• End Connections: Grooved Body with Flanged OSY Gate Valves
• Lead-Free Compliant: Yes
• Valve Type: Double Check Backflow Preventer
• UPC: 612052111650

Standard Information

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