Rein EPT0191 Engine Coolant Reservoir

OE-Quality Expansion Tank

The Rein EPT0191 engine coolant reservoir is an application-specific replacement built for Audi cooling systems that need reliable expansion capacity and stable fitment. It is made from virgin plastic to match OE material expectations and resist cracking from repeated heat cycles.

• Virgin plastic construction with no regrind for improved durability.
• Resists heat-cycle cracking that can lead to coolant loss.
• Direct-fit design for straightforward replacement.
• Manufactured to strict material and tolerance standards.

Built for Cooling System Service

This Rein expansion tank is intended for Audi A6, Audi A6 Quattro, Audi A7 Quattro, Audi S6, Audi S7, and Audi RS7 applications across the listed model years. The EPT0191 part number is associated with OE-quality construction and fitment-focused engineering, making it a practical choice when replacing a worn or damaged coolant reservoir. This part cross-references Audi OE numbers (e.g., 4G0121403AC, 4G0121403D) for the same application.

Common Problems It Can Address

• Cracked coolant reservoir housing.
• Coolant loss from heat-related plastic fatigue.
• Reservoir replacement after age-related wear.
• Fitment issues caused by a damaged original tank.

Installation Notes

Verify the part number and compare the reservoir shape, mounting points, and hose connections before installation. Confirm the vehicle application against the listed fitment for Audi A6, Audi A6 Quattro, Audi A7 Quattro, Audi S6, Audi S7, and Audi RS7 models. The direct-fit design supports a straightforward replacement process.

Quality Assurance

Rein manufactures this expansion tank to OE-quality material and engineering standards. The EPT0191 is backed by a 24,000-mile warranty distance.