Rein CPE0027P Engine Coolant Reservoir Cap

OE Quality Expansion Tank Cap

Rein CPE0027P is an application-specific engine coolant reservoir cap built as a direct replacement for the original cap on select Porsche cooling systems. It is engineered to maintain the proper coolant system pressure required by OE specifications, helping preserve stable operating conditions in Porsche 911, Boxster, Cayman, 718 Boxster, 718 Cayman, and 718 Spyder applications.

Key Features

• Manufactured to strict engineering standards for materials and tolerances.
• Direct fit replacement for the factory expansion tank cap.
• Meets or exceeds OE pressure specifications.
• Produced by an original equipment supplier.
• Black finish.

Product Details

This Rein expansion tank cap is designed to match the function and fit of the OE part while using materials selected for long service life. The cap helps keep the cooling system sealed at the correct pressure, which is critical for consistent coolant performance in Porsche 911 and Porsche Boxster platforms, as well as Cayman and 718 models. Part number CPE0027P is a practical OE-quality replacement for drivers and technicians looking to restore proper reservoir cap operation without changing the original system design.

This part cross-references URO 443121321 for the same application.

Common Cooling System Issues It Can Address

• Loss of coolant system pressure from a worn or weakened cap.
• Coolant seepage at the expansion tank cap seal.
• Pressure-related warning signs caused by an aging reservoir cap.
• Improper sealing after routine cooling system service.
• Replacement needs on Porsche 911, Boxster, Cayman, 718 Boxster, 718 Cayman, and 718 Spyder models.

Installation Notes

Verify the cap style and application before installation. Inspect the expansion tank neck and sealing surface for damage, contamination, or residue before fitting the new cap. Confirm the cap is fully seated and tightened according to the vehicle’s service procedure. For Porsche cooling system service, use the correct coolant and follow factory pressure and bleed procedures.

Quality Assurance

Rein manufactures this cap to OE-quality standards and produces it through an original equipment supplier. The design is intended to meet or exceed the pressure requirements specified by the OE manufacturer, supporting reliable cooling system operation. Part number CPE0027P is built for direct replacement use in the listed Porsche applications.