1" Bronze Backflow Preventer Check Valve, Lead-Free

Apollo® DUCLF4A Dual Check Valve – Compact, Code-Compliant Backflow Protection

The Apollo® Model DUCLF4A (4ALF-300 Series) Dual Check Valve is designed to protect potable water systems by preventing reverse flow caused by backpressure or backsiphonage. This lead-free assembly is ideal for residential and light commercial applications requiring reliable, low-maintenance cross-connection control in compliance with plumbing codes and health standards.

Compact in form but robust in performance, the DUCLF4A offers a corrosion-resistant body, independently operating internal checks, and replaceable check modules—making it a smart, serviceable solution for contractors seeking both performance and installation efficiency.

Contractor-Focused Features

• Certified Lead-Free Design – Constructed from lead-free materials to meet federal and state drinking water regulations (NSF/ANSI 372 compliant).
• Dual Independently-Acting Checks – Offers continuous backflow protection by utilizing two check valves operating separately.
• Minimal Pressure Drop – Engineered for low head loss to maintain system efficiency and minimize disruption to flow.
• Corrosion-Resistant Components – Ensures long service life even in systems exposed to aggressive water conditions.
• Replaceable Internal Modules – Facilitates field repair and extends product lifecycle without full valve replacement.
• Standard Lay Lengths – Simplifies retrofit work and compatibility with existing plumbing systems.

Product Specifications

• Size: 1" NPT
• Valve Type: Dual Check
• Material: Lead-free bronze body with corrosion-resistant internals
• Installation Orientation: Horizontal or vertical (flow-up)
• Pressure Rating: Suitable for standard system pressures up to 175 PSI
• Certifications: ASSE 1024, NSF/ANSI 61 & 372

Installation & Application Notes

The DUCLF4A is intended for installation in potable water lines downstream of the meter. It should be installed in accordance with local and national codes, and backflow prevention practices. While designed for ease of installation and maintenance, professional installation is recommended to ensure correct orientation, testing, and long-term performance. Isolation valves and unions are often installed upstream/downstream to facilitate servicing.

Built for Performance. Designed for Ease.

• Compact Footprint – Ideal for retrofit jobs or new installations where space is limited.
• Field-Serviceable – Maintenance-friendly design with accessible internal checks.
• Industry-Proven Construction – Backed by Apollo’s reputation for precision manufacturing and reliability in water systems.

Dependable Water System Protection

The Apollo® DUCLF4A is a proven solution for backflow prevention where a dual check valve is permitted by code. It combines quality materials, thoughtful engineering, and field-serviceable components—making it a top choice for professionals focused on safeguarding potable water supplies with long-lasting, code-compliant protection.