GM OEM L5P Coolant Reservoir Tank. Genuine GM part is guaranteed by GM's factory warranty!

ACDelco GM Original Equipment Engine Coolant Reservoirs are designed, engineered, and tested to rigorous standards, and are backed by General Motors.
Reservoirs typically hold excess or an expansion of coolant and help maintain optimal operating temperatures in your vehicle's engine. If additional coolant is needed, it can be removed from the reservoir and circulated into the engine coolant system.

Features and Benefits:
-Helps maintain optimal engine operating temperatures
-Designed to contain excess or an expansion of coolant
-When needed, helps circulate more coolant into the coolant system