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Backflow Prevention



Field Testable Dual Check Vacuum Breaker with Atmospheric Vent


3/4 in. (20mm)


Series N9-CD Field Testable Dual Check Vacuum Breakers with Atmospheric Vent prevent high-hazard backsiphonage backflow and low-head backpressure (10 ft. or less) from contaminating the potable water supply. It prevents backflow associated with hose connections when screwed directly to a sill cock, yard hydrant, or wall hydrant. It consists of a brass body construction with two independently operating rubber and stainless steel check valves, with an atmospheric vent located between the them. Series N9-CD is in-line field testable, non-removable and designed for non-continuous pressure applications. It is ideal for installation in service sinks, chemical dispensers, sill cocks, and frost-proof hydrants. Series N9-CD-C comes with chrome plating. Maximum Working Pressure: 125psi (10.6 bar).

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Disclaimer: Watts product dimensions in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements, please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.

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USC Cross-Connections in Household Plumbing Systems Study

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