1/2" Combination water feeder & backflow preventer (Combination 1156F - 9D), Bronze, Press

Watts 0386473 – 1/2" Bronze Boiler Fill Valve with Integrated Backflow Prevention

Designed for performance and protection, the Watts 0386473 combination valve brings together a Model 1156F feed water pressure regulator and a Model 9D dual-check backflow preventer into one compact, factory-assembled unit. This professional-grade solution ensures consistent boiler make-up water supply while safeguarding potable lines against contamination due to backpressure or backsiphonage.

Engineered for Hydronic Heating Applications

Whether installed in residential or light commercial systems, this unit offers a dependable solution for controlling system pressure and protecting water quality. The pressure regulator delivers a preset 15 psi feed, while the dual check valves ensure non-return compliance. Designed for soldered or threaded connections, the valve’s bronze body resists corrosion and stands up to years of heating system use.

Performance Features

• Factory-Assembled Combination – Includes Watts 1156F pressure regulator and 9D backflow preventer, saving installation time and reducing joint leak risk.
• High-Capacity Feed Valve – Maintains system fill pressure and accommodates system purging requirements quickly and efficiently.
• Heavy-Duty Bronze Body – Rugged construction for long service life in closed-loop heating systems.
• Flexible Orientation – Designed for either vertical or horizontal installation configurations.
• Code-Compliant Design – Meets backflow prevention requirements and is Buy American Act compliant.

Specifications

• Model Number: 0386473
• Size: 1/2" NPT inlet and outlet
• Pressure Rating: 100 psi (6.9 bar) max working pressure
• Temperature Rating: 212°F (100°C) max
• Material: Cast bronze body, corrosion resistant

Professional Installation Recommended

While the valve is engineered for straightforward installation, proper connection and pressure setting are essential to performance. For that reason, professional installation by a licensed technician is advised. Installers should confirm system requirements and local plumbing codes before commissioning the unit.

Trade Application Insights

For Contractors: The Watts 386473 delivers consistent feed pressure and dual-check protection in a pre-assembled body—reducing install time and part management. Ideal for both retrofit and new installs in hydronic boiler systems.

For Technically-Skilled Homeowners: This component can be installed by experienced DIYers with the appropriate knowledge and tools, but any adjustments to pressure settings or system diagnostics should be handled by a professional.

Upgrade Boiler System Reliability

With the Watts 0386473 combination fill and backflow valve, you get a proven performer that ensures your boiler maintains system pressure while protecting your potable water line. Built to handle demanding heating environments, this dual-purpose unit helps you deliver consistent quality and code compliance on every job.