Buy OEM Subaru Part # 21132AA121 (21132AA120). Engine Coolant Reservoir. Tank Water. Engine Coolant Expansion Tank A failed expansion tank can cause the cooling system in your Subaru

A Container that holds Engine Coolant.

TANK ASSEMBLY-WATER Engine Coolant Reservoir

Fits Forester, Impreza, Legacy, Outback, WRX

Engine Coolant Expansion Tank
A failed expansion tank can cause the cooling system in your Subaru to leak antifreeze, or it can cause your engine to overheat. If you're losing coolant, contact our service department to avoid engine damage.