Genuine Porsche PAB-121-321-B Expansion Tank Cap

The Genuine Porsche PAB-121-321-B is a factory OEM expansion tank cap designed specifically for Porsche Cayenne models. This essential cooling system component maintains proper pressure in the coolant reservoir, ensuring optimal engine cooling performance and preventing coolant loss.

Key Features:

• Genuine Porsche OEM part ensuring perfect fit and reliability
• Direct replacement for PAB-121-321-00
• Designed for 2.9L, 3.0L, and 4.0L engines (non-hybrid applications)
• Engineered to maintain proper cooling system pressure
• Factory specifications for precise fitment and performance

As an authentic Porsche component, this expansion tank cap is manufactured to exacting factory standards. It serves as the primary coolant reservoir cap and is a critical part of the cooling system, preventing overheating and ensuring your Porsche operates at optimal temperatures. Simple screw-on installation makes replacement straightforward for DIY enthusiasts or professional technicians.