Genuine 20795777 Engine Coolant Expansion Tank Hose - OEM

The Genuine 20795777 is an OEM-quality expansion tank hose designed as a direct factory replacement for GM vehicles. This coolant overflow hose connects the engine's cooling system to the coolant expansion (overflow/surge) tank, allowing the system to manage coolant volume changes as the engine heats and cools during normal operation.

As a Genuine OEM part, this hose is manufactured to the exact specifications of the original component installed at the factory, ensuring a precise fit and reliable, long-term performance without the guesswork of aftermarket alternatives.

Key Features:

• OEM Genuine GM replacement part — exact factory fit and finish
• Designed to connect the cooling system to the coolant expansion/surge tank
• Constructed from heat- and coolant-resistant rubber compound for durability
• Maintains proper coolant system pressure and overflow management
• Direct drop-in replacement — no modifications required
• Helps prevent coolant loss and engine overheating

Replacing a cracked, brittle, or leaking expansion tank hose is essential to maintaining a healthy cooling system. Using a Genuine OEM part like the 20795777 ensures compatibility and reliability over the life of the vehicle.