Multiquip RE560900 DEF Backflow Line

The Multiquip RE560900 is a genuine OEM DEF Backflow Line designed for the DCA Super-Silent generator series, including DCA70SSJU4F, DCA150SSJU4F, DCA220SSJU4F, DCA300SSJU4F, DCA300SSJU4F2, DCA300SSJU4F3, and DCA300SSJU4F3PD models in both standard and 60Hz configurations. As a direct Multiquip OEM part, RE560900 is manufactured to the exact specifications of the original component, ensuring a proper fit within the DEF (Diesel Exhaust Fluid) system. This part supports the emissions control system that keeps Tier 4 Final compliant generators operating within regulatory requirements. Sourced directly through DHS Equipment, you can trust you are receiving an authentic Multiquip replacement backed by the manufacturer.

Key Features

• Genuine OEM DEF System Integrity — manufactured to exact routing and connector specifications for the DEF circuit, ensuring no fluid compatibility issues or pressure loss at connection points.
• Direct-Fit Replacement — engineered to connect to the existing DEF system mounting points without alteration, maintaining the original fluid return path from the DEF dosing module.
• Broad DCA Series Compatibility — fits DCA70SSJU4F, DCA150SSJU4F, DCA220SSJU4F, DCA300SSJU4F, DCA300SSJU4F2, DCA300SSJU4F3, and DCA300SSJU4F3PD across standard and 60Hz variants.
• Emissions System Performance — a properly functioning DEF backflow line maintains correct fluid pressure and return flow in the SCR aftertreatment system, preventing fault codes and unplanned shutdowns on Tier 4 Final generators.
• Regulatory Compliance Assurance — the DEF and SCR system is integral to Tier 4 Final emissions compliance; using the correct OEM line helps ensure the generator continues to meet EPA and Tier 4 Final standards.

The DEF backflow line is a fluid return line within the Selective Catalytic Reduction (SCR) aftertreatment system found on Tier 4 Final diesel generators. It routes unused or excess Diesel Exhaust Fluid back from the dosing injector or pump assembly to the DEF tank, maintaining consistent fluid pressure and preventing air locks within the system. When this line cracks, leaks, or becomes blocked, the DEF dosing system can lose prime, trigger emissions fault codes, and ultimately cause the generator to derate or shut down to remain within emissions compliance limits.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

Why Buy From DHS Equipment

Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.

Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.